big block head comparison

Discussion in 'Cams, Heads and Valve Trains' started by grumpyvette, Oct 2, 2008.

  1. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.corvettefever.com/techarticl ... index.html
    Cylinder Pressure Note: youll generally want to try hard to maximize the useable compression as the higher the compression before you get into detonation the more efficiently the fuel can be burnt and the more torque the engine can produce, if limited to pump high test 92-93 octane fuel,165 psi # of cylinder pressure is about the best cylinder pressure for Iron heads with 92-93 octane, using pure un-ethanol laced fuel, gasoline. while the faster heat transfer rate of aluminum cylinder heads will usually allow 190psi # as the upper limit or best for aluminum heads.
    viewtopic.php?f=52&t=796

    http://garage.grumpysperformance.co...-about-your-potential-dream-bbc-combos.14607/

    http://raceflowdevelopment.com/product/rfd-24-victor-pro-mc/

    http://www.wengines.com/BBCweingartner.html

    http://www.dragzine.com/tech-stories/engine/ultimate-guide-to-budget-bbc-cylinder-heads-under-2000/


    [​IMG]
    mark iv blocks
    [​IMG]
    mark v blocks
    [​IMG]
    (keep in mind that ALL '91 and later Gen.V and Gen.VI big blocks come with 4-bolt main caps. The two-bolt big blocks are no longer in production
    MANY BUT NOT ALL aftermarket head designs have been modified to work on both the early MARK IV 1965-90 and later MARK V & VI blocks 1991-later.)

    BTW, , on BIG BLOCKS the oil pumps and oil filter adapters are different due to the block oil filter recess and rear seals being different
    GEN 4 or MARK IV
    [​IMG]

    GEN V and VI
    [​IMG]


    http://users.erols.com/srweiss/tablehdc ... _Big_Block

    https://sdparts.com/details/gm-performa ... s/12363392

    http://www.summitracing.com/parts/bro-2021012/overview/

    http://www.summitracing.com/parts/bro-2061000/overview/

    http://www.summitracing.com/parts/afr-2001/overview/

    http://www.summitracing.com/parts/edl-60559/overview/

    http://www.summitracing.com/parts/edl-60499/overview/

    http://www.summitracing.com/parts/drt-1 ... /overview/

    http://www.summitracing.com/parts/tfs-4 ... /overview/

    http://www.summitracing.com/parts/tfs-4 ... /overview/

    http://www.profilerperformance.com/raci ... rted-heads

    http://users.erols.com/srweiss/tablehdc.htm

    http://www.skipwhiteperformance.com/det ... =BBC-OVP-A
    I KNOW ITS A P.I.T.A. but you tend to get what you pay for and Chinese import head casting and machine work at 1/2 the price is tempting, but usually wasted money

    BIG BLOCK CYLINDER HEAD COMPARISON ON CHEVY HIGH PERFORMANCE tested on the same 502 BBC
    All flow figures on best ports, READ CAREFULLY AND NOTICE THE TQ STAYS AT ALMOST THE SAME PEAK due to similar compression and displacement but the HP varies with the flow rates as the rpms increase

    AIR FLOW RESEARCH 325cc
    $2485 ALUMINUM
    Max hp 665
    Max tq 593
    intake
    .200-158
    .300-235
    .400-298
    .500-341
    .600-370
    .700-362
    exhaust
    .200-127
    .300-188
    .400-244
    .500-268
    .600-278
    .700-285
    the reason WHY the optionally fully CNC ported heads flow so well

    brodix
    RR OVAL 270cc port CNC chamber

    .050 - 42 / 33 78.6
    .100 - 77 / 65 84.4
    .200 - 152 / 118 77.6
    .300 - 224 / 147 65.6
    .400 - 283 / 178 62.9
    .500 - 318 / 205 64.5
    .600 - 344 / 230 66.9
    .700 - 347 / 248 71.5


    AFR 265 CNC chamber

    .050 - 39 / 32 82.1
    .100 - 75 / 64 85.3
    .200 - 168 / 144 85.7
    .300 - 252 / 196 77.8
    .400 - 307 / 232 75.6
    .500 - 339 / 248 73.2
    .600 - 350 / 254 72.6
    .650 - 343 / 255 74.3


    AFR 290

    .100 - 74 / 63 85.1
    .200 - 171 / 142 83.0
    .300 - 249 / 200 80.3
    .400 - 303 / 241 79.5
    .500 - 342 / 259 75.7
    .600 - 369 / 267 72.4
    .650 - 365 / 270 74.0
    .700 - 362 / 272 75.1

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    if you have any engine and want too find the true compression you need to deal in verified fact, not assume what the manufacturers suggest is always correct.
    you just cc the heads, combustion chamber volume, place the piston 1" down the bore and seal the rings gap around the pistons,
    above the rings with moly grease or Vaseline and measure that volume and calculate what a bore diameter cylinder 1" tall would
    contain, minus the volume you,ve measured, the piston dome took up.then calculate the true compression.


    measure the piston deck height after the machined block has the rotating assembly test fitted
    [​IMG]
    [​IMG]
    [​IMG]


    [​IMG]
    [​IMG]
    [​IMG]

    read related linked info

    http://garage.grumpysperformance.co...n-chamber-or-piston-dome-or-port-volume.2077/


    http://garage.grumpysperformance.com/index.php?threads/ccing-my-heads.14187/#post-71989

    http://garage.grumpysperformance.co...ng-combustion-chambers.2630/page-3#post-77963

    [​IMG]
    [​IMG]


    BRODIX RACE RIGHT 294cc

    $2393 per pair
    Max hp-634
    Max tq-582



    intake
    .200-141
    .300-212
    .400-269
    .500-310
    .600-332
    .700-340
    exhaust
    .200-120
    .300-159
    .400-186
    .500-212
    .600-238
    .700-262

    Dart cnc pro1 335cc
    $3654 per pair
    Max hp660
    Max tq598
    intake
    .200-154
    .300-222
    .400-280
    .500-322
    .600-355
    .700-374
    exhaust
    .200-124
    .300-175
    .400-233
    .500-272
    .600-292
    .700-311

    EDELBROCK 454R 315cc
    Aluminum # 60559 $1779 per pair
    Max hp-616
    Max tq-566

    intake
    .200-130
    .300-198
    .400-256
    .500-287
    .600-311
    .700-326
    exhaust
    .200-122
    .300-158
    .400-185
    .500-211
    .600-236
    .700-253


    RACINF HEAD SEARVICE 320CC
    Cast iron $2534 per pair
    Max hp -638
    Max tq-584

    intake
    .200-132
    .300-199
    .400-266
    .500-319
    .600-338
    .700-356
    exhaust
    .200-113
    .300-163
    .400-197
    .500-228
    .600-259
    .700-280

    TRICKFLOW 320cc
    Aluminum $2095cc


    Max hp- 655
    Max tq-587

    intake
    .200-146
    .300-215
    .400-271
    .500-321
    .600-353
    .700-358
    exhaust
    .200-128
    .300-171
    .400-207
    .500-243
    .600-271
    .700-290

    world products 310cc MERLIN III
    Aluminum
    $2447 per pair
    Max hp-631
    Max tq-581

    intake
    .200-136
    .300-200
    .400-254
    .500-297
    .600-330
    .700-345
    exhaust
    .200-105
    .300-144
    .400-173
    .500-197
    .600-217
    .700-233


    ID suggest you select from heads from these sources
    Jegs; 800/345-4545; Jegs.com

    Summit Racing; 800/230-3030; SummitRacing.com

    Scoggin-Dickey Parts Center; 800/456-0211; ScogginDickey.com


    TRICKFLOW
    http://www.trickflow.com/egnsearch.asp? ... 4294867081
    http://www.trickflow.com/customerservice
    1-330-630-1555 • 1-888-841-6556

    BRODIX
    http://www.brodix.com/heads/heads.html
    479.394.1075

    DART
    http://www.dartheads.com/products/cylinder-heads
    Dart Machinery; 248/362-1188; DartHeads.com


    AIR FLOW RESEARCH
    http://www.airflowresearch.com/
    toll free: 877-892-8844
    tel: 661-257-8124

    Patriot Performance
    Patriot Performance; 888/462-8276; Patriot-Performance.com

    TRJ
    http://trjperformance.com/cylinder-heads-top-end-kits-components/complete-heads/

    RHS
    http://www.racingheadservice.com/rhs/cylinder-headshtml
    Toll Free: 877-776-4323
    Local: 901-259-1134

    EDELBROCK
    http://www.edelbrock.com/automotive_new ... main.shtml
    Edelbrock; 310/781-2222; Edelbrock.com

    BMP (world products)
    http://www.theengineshop.com/products/cylinder-heads
    http://www.theengineshop.com/produc...lum-heads-font/bmp-bbc-16-aluminum-heads.html
    Tel: 631-737-0372
    Fax: 631-737-0467

    BUTLER PERFORMANCE
    http://www.butlerperformance.com/products/cylinder_heads/cylinder_head_labor.html
    866-762-7527

    BLUE PRINT ENGINES
    http://www.blueprintengines.com/ind...sb-chevy-aluminum-cylinder-heads-cnc-machined
    1800-483-4263

    PRO-FILER
    https://www.profilerperformance.com/
    937‐846‐1333
     
    Last edited by a moderator: Jul 15, 2018
  2. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.airflowresearch.com/articles ... 1/A-P1.htm
    http://www.airflowresearch.com/305bbc_rh.php
    [​IMG]
    http://www.racingheadservice.com/Inform ... -Heads.asp
    [​IMG]
    [​IMG]
    http://www.airflowresearch.com/315bbc_rh.php
    [​IMG]
    http://www.airflowresearch.com/325bbc_rh.php
    [​IMG]
    http://www.airflowresearch.com/335bbc_rh.php
    [​IMG]

    http://www.airflowresearch.com/345bbc_rh.php
    [​IMG]
    http://www.airflowresearch.com/357bbc_rh.php

    [​IMG]
    http://garage.grumpysperformance.com/index.php?threads/aftermarket-heads-for-a-bbc.12316/
    before you reach for your wallet, do some basic math and read a few dozen related links
    http://www.wallaceracing.com/calcafhp.php

    http://www.superchevy.com/how-to/en...-0902-chevy-engine-port-variations-measuring/

    http://www.gmhpclub.com/performancecalculators.htm

    http://garage.grumpysperformance.com/index.php?threads/port-speeds-and-area.333/#post-37705
    USE THE CALCULATORS to match port size to intended rpm levels... but keep in mind valve lift and port flow limitations
    http://www.wallaceracing.com/runnertorquecalc.php
    http://www.wallaceracing.com/ca-calc.php
    http://www.wallaceracing.com/area-under-curve.php
    http://www.wallaceracing.com/chokepoint.php
    http://www.wallaceracing.com/header_length.php
    http://www.circletrack.com/enginetech/1 ... ch_engine/



    http://www.wallaceracing.com/calcafhp.php

    http://hpwizard.com/engine-horsepower-calculator.html

    http://www.hotrod.com/articles/airflow-research-cylinder-power/

    http://www.powerperformancenews.com/tech-articles/cylinder-head-tech-airflow-vs-power/

    http://www.calculator.net/engine-horsepower-calculator.html

    http://www.calculatoredge.com/new/horsepower.htm
    AFR OVAL PORT BBC FLOW NUMBERS
    .050 - 39.4 / 32.2
    .100 - 75.6 / 64.4
    .200 - 168.0 / 144.5
    .300 - 252.4 / 196.4
    .400 - 307.3 / 232.5
    .500 - 339.4 / 248.5
    .600 - 350.7 / 254
    .650 - 343.6 / 255
     
    Last edited by a moderator: Jun 18, 2017
  3. grumpyvette

    grumpyvette Administrator Staff Member

    trickflow bbc heads
    http://www.summitracing.com/streetandst ... ABF6E40%7D
    BMF
    http://www.thebmfstore.com/SearchResults.asp?Cat=20

    RFD
    http://raceflowdevelopment.com/product/rfd-24-victor-pro-mc/
    brodix
    http://www.brodix.com/heads/headhunter.html

    http://www.brodix.com/heads/headhunter.html

    BBC Brodix Race Rite 270cc oval port flow numbers
    just flowed a set of out of the box Brodix Race Rite oval port 270cc head. Here is the data

    2.25/1.88 back cut on intake tulip exhaust valve
    Throat
    Long and Short runner 90%throat
    Long and short runner bowl 91%
    Short side long runner 2.93Csa
    Short side short Runner 3.01CSA
    Pinch Long runner 2.72CSA
    Pinch Short Runner 2.74CSA

    Flowed on a 4.310 bore

    Intake Long
    .1-77
    .2-155
    .3-219
    .4-259
    .5-292
    .6-313
    .7-320
    .8-321
    .9-316
    1.0-311

    Intake Short
    .1-78
    .2-148
    .3-210
    .4-252
    .5-280
    .6-305
    .7-318
    .8-327
    .9-326
    1.0-331

    Exhaust no pipe
    .1-59
    .2-100
    .3-128
    .4-158
    .5-183
    .6-205
    .7-225
    .8-239
    .9-252

    bbc oval ports making 697hp
    http://www.popularhotrodding.com/tech/0 ... /dyno.html

    http://www.profilerperformance.com/bbc-heads-174.html

    http://www.brodix.com/heads/jjbb.html

    http://www.wengines.com/BBCweingartner.html

    http://www.trickflow.com/partdetail.asp?part=TFS-4131B001&autoview=sku

    http://static.trickflow.com/global/images/instructions/flow chart poweroval street bbc.pdf

    http://forum.grumpysperformance.com/viewtopic.php?f=52&t=796&p=1165#p1165

    big block engines can be fun, as this photo shows
    [​IMG]
     
    Last edited by a moderator: Dec 23, 2015
  4. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.superchevy.com/technical/eng ... index.html
    Big-Block Cylinder Heads - Head Trip, Part 2
    Big-block heads for the spendthrift builder


    all contributors: Mike Harrington




    Oxymoron. Webster's dictionary defines this word as: "a combination of contradictory or incongruous words (as cruel kindness); broadly: something (as a concept) that is made up of contradictory or incongruous elements."

    Besides "cruel kindness" here are some other examples: adult male, authentic replica, honest politician, jumbo shrimp, and military intelligence. For a long time, people would put the phrase "budget big-block" in there, too. But a little research proved there are very good values out there for those building a Rat with an eye on cost conservation.

    In the last issue of Super Chevy, we went down the list of cylinder head manufacturers and got the latest dope from each company on their most popular off-the-shelf small-block cylinder heads. Mind you, we also informed each company that our aim was to search out their best "cost-conscious" cylinder heads. This month, we searched out those same parts for Chevy's fabled Rat motor. Yes, it's true that when one dives into the big-block waters, budget is a word that seldom comes to mind. Budgets, however, are like waist sizes-they vary from person to person. If only our wallets were akin to our waist sizes, what a wonderful world this would be.

    It turns out that purchasing a set of BBC cylinder heads won't require you to sell a kidney on the black market; they're more affordable than you may think. When purchasing a set of cylinder heads, most DIYers prefer the out-of-the-box, preassembled units. Unless you're running some insanely wild cam, the springs and valves in the preassembled heads are capable of delivering some great performance numbers over the OE-spec heads. In no particular order, here are the companies we contacted and the information they provided.




    World Products
    (631) 981-1918
    http://www.worldcastings.com

    Merlin Cast Iron 269cc BBC Cylinder Head, Merlin III Cast Iron 320cc BBC Cylinder Head

    World has a couple of BB heads that are perfect for the budget builder. The first one is the assembled Merlin oval port cast iron head, with a 269cc intake volume, a 119cc combustion chamber, 2.300x1.88 valves and 11/32 guides. Out of the box these heads run about $720. The next step up is the Merlin III. This head features a 320cc intake chamber and opens up to a 345cc intake chamber. The combustion chamber, valves and guides are the same as the Merlin. An assembled set of the 345cc heads will run about $1,459.




    Racing Head Service
    (877) 766-4323
    http://www.racingheadservice.com

    Pro Action Cast Iron 320cc Cylinder Head, 360cc BBC Cylinder Head

    Racing Head Service knocked one out with its Pro Action cast iron heads. The Pro Action heads come in a 320cc and 360cc intake runner. Both heads feature a 119cc combustion chamber with intake valves (with hardened seats) that measure 2.250 and exhaust valves that measure 1.880. A pair of assembled 360cc heads built for a hydraulic roller cam runs about $1,810. The same set built for a mechanical roller runs about $2,064.




    Summit Racing Equipment
    (800) 230-3030
    http://www.summitracing.com

    Square Port Iron 308cc BBC Cylinder Head

    Millions have ordered parts from Summit Racing, but some may not be familiar with the fact that Summit also offers its own line of cylinder heads for the Chevy big-block. Summit has set of cast-iron heads that are ready to run from the moment you open the box. The Summit square port iron heads feature a 308cc intake runner with a 119cc combustion chamber, a 2.250 intake valve and a 1.880 exhaust valve with hardened seats. A pair of assembled heads runs about $1,291.

    Big-Block Cylinder Heads - Head Trip, Part 2





    Brodix
    (479) 394-1075
    http://www.brodix.com

    Race Rite BB-R 294cc, BB-O 270cc BBC Cylinder Head

    Brodix has a direct replacement for stock cast-iron heads. These heads from its Race Rite series are made from cast aluminum and are available in rectangular or oval port castings. Brodix has also designed the Race Rite heads to work directly with the stock pistons and intake manifold. The Race Rite heads come in two available sizes: the BB-R comes with a 294cc intake port while the BB-O comes with a 270cc intake port. Both heads have a 119cc combustion chamber, a 2.250 intake valve, and a 1.880 exhaust valve. An out-of-the-box assembled pair of the Race Rite heads runs approximately $1,939.




    Holley
    (270) 782-2800
    http://www.holley.com

    Aluminum Oval Port 261cc Intake BBC Cylinder Head

    Holley gets it done with a pair of aluminum oval port heads that have been CNC-machined. They are made for engines made from 1965 to 1975 with EGR (pn 300-556), and without EGR (pn 300-554). The Holley heads have 261cc intake and 110cc combustion chamber that are designed for low compression pump gas use. These heads come with a 2.19 and 1.88 intake and exhaust valves and stock location exhaust ports. An assembled set of heads will run about $2,200.




    Jegs
    (800) 345-4545
    http://www.jegs.com

    "J" Series Cast Aluminum 310cc BBC Cylinder Head

    Jegs High Performance not only sells just about any performance part you can think of, it also sells its own performance Rat heads. Jegs "J" series of BBC heads are cast aluminum and CNC-machined for a precise fit. These square port aluminum heads feature 310cc intake runners, as-cast 119cc combustion chambers and raised exhaust ports (.625-inch). Jegs uses longer valves so you will need to check pushrod length. A pair of assembled "J" series heads retails at $1,779 (base price).




    Air Flow Research
    (877) 892-8844
    http://www.airflowresearch.com

    Magnum 325cc BBC Cylinder Head

    AFR's Magnum heads are available with a variety of upgrades, ranging from intake port sizes starting at 305 cc all the way to 357 cc. The upgrades are almost too numerous to list, so we'll take a look at the as-cast, CNC bowl-blended, aluminum Magnum 325cc intake port head. This particular head comes with the standard 119cc combustion chambers, 2.250 intake valves and 1.880 exhaust valves. Should you desire a fully CNC'd set of heads from AFR, all you have to do is ask. A pair of the 325cc heads usually retails for around $2,485.




    Edelbrock
    (800) 416-8628
    http://www.edelbrock.com

    Oval Port Aluminum Performer 290cc BBC Cylinder Head

    The Edelbrock Performer series of cylinder heads really needs no introduction. The oval port aluminum Performer heads feature 290cc intake ports and 110cc combustion chambers with 2.19 and 1.88 intake and exhaust valves. The Performer is a great streetable head and retails for about $1,920.




    GM Performance Parts
    (877) 892-8844
    http://www.airflowresearch.com

    Oval Port Aluminum 290cc BBC Cylinder Head

    GMPP has a pair of great aluminum oval port heads featuring 290cc intake runners and 110cc combustion chambers and 2.250 and 1.880 intake and exhaust valves. The exhaust ports are in the stock location so there's no need to mess around with new headers. Out of the box, an assembled pair of these heads will run about $1,920.

    Trick Flow Specialties
    http://www.trickflow.com
    (330) 630-1555

    Oval Port Aluminum 280cc BBC Cylinder head

    Trick Flow also has a few big-block cylinder heads, but we will focus on its premier budget cylinder head, the oval port aluminum version. It helps build great low- to mid-range horsepower. These heads have 280cc intake runners and 113cc combustion chambers. An assembled set of these heads runs approximately $1,925.
    [​IMG]
    [​IMG]


    Powerhouse Engine Components
    (661) 861-0167
    http://www.enginekits.com

    Cast Aluminum 320cc BBC Cylinder Head

    Powerhouse surprised us with a set of cast aluminum big-block heads that feature 320cc intake runners and 115cc combustion chambers. The intake and exhaust valves measure in at 2.25 and 1.88 respectively. These heads are assembled for hydraulic flat tapped lifters, and upgrades are available, so give them a call. An assembled set from Powerhouse will cost $1199.

    Going Back To Last Month
    Editor's note: Due to circumstances beyond our control, the following text and photos from part 1 of this story (which dealt with small-block cylinder heads) were left out of the May issue. Here is the conclusion of Head Trip, Part 1, in its entirety. We apologize for the error.

    http://www.hotrod.com/how-to/engine/0906phr-10-questions-chevy-big-block/
    [​IMG]
    [​IMG]

    [​IMG]


    JEGS
    (877) 892-8844
    (800) 345-4545
    http://www.jegs.com

    High-flow 197cc Aluminum SBC Cylinder Heads, 220cc Aluminum SBC Cylinder Heads

    These heads are designed to support 425-500 hp in 350-406ci engines. They feature large, high quality stainless steel 2.055-inch intake and 1.600 exhaust valves. According to Jegs, the intake port cross-section was designed for good mid-range power. The heads work well with cams featuring duration of 210-240? @ .050 inches. 197cc Intake runners, 1.440-inch springs, 1.875-inch installed height, 130-pound seat pressure, 3/8-inch studs, and 5/16-inch guideplates included; 2.055-inch intake/1.600-inch exhaust. Cost: $1,118 (197cc head).

    Jegs also has a 220cc high-flowing aluminum head. It features 220cc intake runners, 240 pounds seat pressure, .680-inch maximum lift, 64cc CNC-machined combustion chambers with angle plug design, 10? locks, steel retainers and bronze guides, 2.100-inch intake and 1.600-inch exhaust stainless steel valves, 7/16-inch rocker studs and 5/16-inch guide plates. Cost: $1,372 (220cc head).




    Summit Racing Equipment
    (800) 230-3030
    http://www.summitracing.com

    Summit 170cc Cast-iron Vortec SBC Cylinder Head, Summit Street & Strip 200cc Aluminum SBC Cylinder Head

    Are you looking for a good set of heads to up the performance factor of your Vortec engine? Summit Performance Vortec cylinder heads have what it takes to get the job done. Featuring wide-open intake runners, efficient combustion chambers, and a high-performance valve job, these heads deliver plenty of power-building airflow. Made from superior iron alloy, these heads come ready-to-run for improved performance straight out of the box.

    Specs: cast iron cylinder head material; combustion chamber volume 67cc; intake runner volume 170cc; intake valve diameter 1.940 inches; exhaust valve diameter 1.500 inches; maximum valve lift 0.520 inches; outside diameter of outer spring 1.250 inches. Cost: $649 (both 170cc and 200cc).




    Trick Flow Specialties
    (330) 630-1555
    http://www.trickflow.com

    Trick Flow 195cc Aluminum SBC Cylinder Head

    Dyno-tested on a 383ci engine, Trick Flow's 64cc 23? 195cc aluminum cylinder heads made 460 hp and 451 lb-ft of torque-40 more horsepower and 11 lb-ft more torque than the same engine with GM L98 Corvette heads. The 195 heads are a direct fit, high-performance replacement for most original equipment factory heads, and accept most factory accessories. They feature a choice of 62cc as-cast, or 64cc and 72cc CNC-profiled combustion chambers, 2.02/1.60 stainless steel valves, hardened exhaust valve seats for unleaded gas, and 195cc intake ports with a high-velocity, small cross-section design to promote low-rpm torque without sacrificing higher-rpm horsepower. The heads are available with three spring sizes: 1.250-inch single for cams up to .480-inch lift; 1.470-inch single for cams up to .540-inch lift; and 1.460-inch dual for cams up to .600-inch lift. They come fully assembled with valves, valve springs, locks, retainers, rocker arm studs, and guideplates. The heads are 50-state emissions-legal under CARB E.O. number D-369-4. Cost: approximately $1,249 (assembled).




    Edelbrock
    (310) 781-2222
    http://www.Edelbrock.com

    Performer 170cc Aluminum SBC Cylinder heads

    The key to any successful engine buildup lies in using parts that work together, and Performer RPM cylinder heads are designed specifically for street-driven cars with moderate compression and pump gas. The high velocity 170cc intake ports produce outstanding throttle response and torque, with enough air flow to produce over 400 hp when used with matching a Performer RPM manifold, cam, and carb. The Performer RPM head #60899 comes fully assembled and ready to run with 2.02/1.60-inch stainless steel valves; valve springs rated up to .575-inch lift; 64cc combustion chambers; 60cc exhaust ports; and straight spark plugs for use with standard exhaust headers. Performer RPM small-block Chevy heads are also available bare, or complete with 70cc combustion chambers and angled spark plugs. Like all Edelbrock heads, they're cast at the Edelbrock Foundry from 356-T6 aluminum and incorporate Heli-Coil inserts in the rocker stud and exhaust bolt holes for strength and durability. Cost: The MSRP is $1,648, but check with your local Edelbrock dealer
    for more info.

    your engines torque curve is more the result of displacement, compression,ratio,selected cam timing and both header design (scavenging) and intake design (SINGLE vs DUAL PLANE ETC.)than just port cross sectional area alone, and if your wearing valve guides the valve train geometry and clearances, and lubrication system, and the oil used in it, and your valve spring rates and seals need to be carefully checked and a rocker stud girdle and roller rockers used
    and port cross sectional area and flow numbers have a larger effect than port shape alone
    naturally you'll need to match the port cross sectional area, length, and plenum to the intended displacement and rpm band, and cam timing, but just assuming a swap from rectangular port to oval will always result in more torque will not always be true over the whole power band, especially if the rest of the combos designed for a totally different rpm band than the heads you've selected.
    tweaks like tuned merge collectors, and slightly different cam timing and intake swaps can get a great deal more of the torque potential from a slightly different port size,and there are calculators you can use to find a limited selection of choices,in header length, diam., collector, intake port length and cross section and runner length, plenum size, cam timing and valve size to look thru.. too narrow your search for the best match to your application vs just guessing and swapping parts till you think you've got it correct

    http://forum.grumpysperformance.com/viewtopic.php?f=52&t=333

    http://www.hughesengines.com/TechArticles/1headflowchartscomparisons.php
     
    Last edited by a moderator: Jun 10, 2016
  5. grumpyvette

    grumpyvette Administrator Staff Member

    WHEN your talking about a car that's expected to be street driven, and geared and cammed to drive on the street, with pump gas,the larger OVAL port heads will generally produce better hp/tq than a 320cc rectangular port head on a 427 BBC, provided the compression ratio and cam and intake are carefully matched

    even the stock oval ports CAN in some cases work well
    [​IMG]
    [​IMG]
    http://maliburacing.com/patrick_budd_article.htm

    http://www.brodix.com/heads/raceritebb.html

    http://users.erols.com/srweiss/tablehdc ... _Big_Block

    http://www.summitracing.com/parts/TFS-41310001/

    It should be obvious that comparing edelbrock oval ports, or mildly reworked stock heads to AFR 305-357cc heads, and an engine with a hydraulic roller cam, is hardly a valid comparison, to an engine with a solid roller , or flat tappet cam, using higher compression and the better rectangular port heads, thats designed to run a couple of thousand rpm higher on average.
    as Im sure you are aware
    now I have built a bunch of big blocks and its not just the heads selected that matters, and you generally try to match the port cross sectional area to the intended displacement and cam timing, but, you can compensate for some minor mis-matches in port size thru the wise selection of other components, but almost all rectangle port heads are designed for the upper rpm band and solid lifter cams that allow them to breath, most but not all oval ports are designed for mid rpm range torque combos
    the 290cc and larger oval ports are generally designed to breath far better than the stock 253cc heads most guys think of when they think oval port heads
    now IM sure not going to tell you that a properly built big block with oval port heads will destroy a properly built big block with rectangle port heads , but if you start limiting the rpm potential with hydraulic cams, want to drive the car in traffic and expect to drive the combo on the street on trips they can provide a very valid option

    bbc oval ports making 697hp
    http://www.popularhotrodding.com/tech/0704phr_chevy_big_block/dyno.html

    http://www.profilerperformance.com/bbc-heads-174.html

    http://www.brodix.com/heads/jjbb.html

    http://www.trickflow.com/partdetail.asp?part=TFS-4131B001&autoview=sku

    http://static.trickflow.com/global/images/instructions/flow chart poweroval street bbc.pdf

    http://forum.grumpysperformance.com/viewtopic.php?f=52&t=796&p=1165#p1165


    BTW if your looking into aftermarket performance cylinder heads for the BIG BLOCK CHEVY, the blocks have different coolant passage lay outs, and require matched heads and head gaskets , but check with the manufacturer of the cylinder heads, many of the better aftermarket big block heads have been modified with a larger sealing surface areas and relocated coolant passage locations and coolant passage shapes so that they can be used with any and all the generations of the big block blocks, if the correct gaskets are used, simply because the manufacturers found that to be far easier than stocking several different castings for basically similar applications




    1. [​IMG]
      the upper closed chamber head is bath tube shaped to provide dual opposed quench areas that squish against the piston deck,
      forcing the fuel air mix toward the central cylinder bore, the lower open chamber head combustion chamber was found to un-shroud the valves,\
      thus increasing the cylinder fill efficiency especially at upper rpms.
      the dome higher compression ratio pistons for both combustion chambers are similar in shape to the combustion chambers they are designed too be used with.
      the closed chamber piston can be used with the larger open chamber combustion chamber , but its reduced volume results in less effective compression and the dome,
      of the closed chamber dome is marginally restrictive to the flame front propagation.

      [​IMG]
      [​IMG]
      [​IMG]

    no, if you have any engine and want too find the true compression you need to deal in verified fact, not assume what the manufacturers suggest is always correct.
    you just cc the heads, combustion chamber volume, place the piston 1" down the bore and seal the rings gap around the pistons,
    above the rings with moly grease or Vaseline and measure that volume and calculate what a bore diameter cylinder 1" tall would
    contain, minus the volume you,ve measured, the piston dome took up.then calculate the true compression.

    measure the piston deck height after the machined block has the rotating assembly test fitted
    [​IMG]
    [​IMG]
    [​IMG]


    [​IMG]
    [​IMG]
    [​IMG]

    read related linked info

    http://garage.grumpysperformance.co...n-chamber-or-piston-dome-or-port-volume.2077/


    http://garage.grumpysperformance.com/index.php?threads/ccing-my-heads.14187/#post-71989

    http://garage.grumpysperformance.co...ng-combustion-chambers.2630/page-3#post-77963
    heres two of the few side-by-side closed chamber vs open chamber pictures I have,
    mortec
    http://www.mortec.com/bbc.htm

    and several other sites list your combustion chambers at 98cc, and most closed chamber heads I see average around 100-107cc so its likely your have had mods


    WELL WORTH READING THRU

    http://victorylibrary.com/mopar/chamber-tech-c.htm

    http://www.corvettefever.com/techarticl ... index.html


    typical tool used to bevel the combustion chambers
    http://www.goodson.com/store/templat...6e31d1882c7e8e
    http://www.goodson.com/store/templat...6e31d1882c7e8e


    MORE OPTIONS

    http://www.trickflow.com/partdetail.asp ... toview=sku

    http://www.profilerperformance.com/bbc-heads-174.html

    http://www.airflowresearch.com/index.php?cPath=68_111

    http://www.jegs.com/p/Brodix/Brodix-Rac ... 9/10002/-1

    http://www.racingheadservice.com/Cylind ... 11-02.aspx

    http://www.edelbrock.com/automotive_new ... mer1.shtml
    100cc heads

    http://www.worldcastings.com/products/m ... heads.html
    80cc heads


    AFR 290 full cnc 28" 4.530 & 4.310 bore no pipe clay radius
    lift - - 4.530 / 4.310 - ex
    100 - 74.70 - 72.90 --- 63.70
    200 - 171.5 - 163.3 --- 142.4
    300 - 249.4 - 237.0 --- 200.9
    400 - 303.4 - 285.9 --- 241.0
    500 - 342.4 - 324.9 --- 259.8
    600 - 369.4 - 352.7 --- 267.5
    650 - 365.7 - 361.8 --- 270.0
    700 - 362.1 - 370.9 --- 272.4

    And here is a couple of other heads on my bench for comparison

    Perf RPM #60459 290cc Intake port 2.19x1.88 110cc chamber
    .100 - 73/ 64
    .200 - 148/119
    .300 - 218/149
    .400 - 268/179
    .500 - 304/207
    .600 - 317/229
    .700 - 319/245

    RR OVAL 270cc port
    100 - 77/65
    200 - 152/118
    300 - 224/147
    400 - 283/178
    500 - 318/205
    600 - 344/230
    700 - 347/248

    AFR 315 CNC
    4.530" ===========4.310" bore
    .100 - 78/69 ========78.1
    .200 - 164/142.5 =====162.3
    .300 - 247/198 ======239.5
    .400 - 309/240====== 290
    .500 - 350/267 ======334.4
    .600 - 375/280 ======358.3
    .700 - 383/283 ======374
     
    Last edited by a moderator: Jul 15, 2018
  6. grumpyvette

    grumpyvette Administrator Staff Member

    NOW if youve got money to burn maybe you want some killer big block heads, trust me! racing engine technology ALWAYS has something new under development that costs far more cash than you can easily come up with and potentially makes all your current components TOTALLY PATHETIC, you can very easily drop $30K-$80K into exotic engine components if you had bill gates check book

    http://www.mbellc.com/index.php/24d-conv401-bbc
    [​IMG]

    http://www.mbellc.com/index.php/11d-big-chief
    [​IMG]


    http://www.mbellc.com/index.php/18d-conv-b-b310-cc
    [​IMG]

    http://www.brodix.com/heads/pb1200.php
    [​IMG]

    http://www.brodix.com/heads/pb1800.php
    [​IMG]

    THERE ARE EVEN HEADS WITH PORTS AND VALVES SO LARGE THEY REQUIRE A CUSTOM BLOCK WITH A LARGER CRANK AND BORE SPACING

    http://www.cnblocks.com/5300BBC/5300BBC.html

    [​IMG]



    [​IMG]

    [​IMG]

    [​IMG]

    http://www.raceflowdevelopment.com/RFD- ... dartBC.htm

    [​IMG]
     
  7. grumpyvette

    grumpyvette Administrator Staff Member

    a back-to-back flow comparison comparing factory "advertised" numbers with actual flow numbers from a SF600 with a FlowCom and Audi swirl meter, 4.500 bore fixture, and see just what the truth is.
    Heads are a good comparison for competitors:
    Dart Pro1 310 as cast, bare, from Dart
    AFR 305 as cast, assembled from AFR

    Dart 310, valve job from Dart, REV 2.25 intake no backcut, REV 1.88 Inconel ex (tulip style valve), advertised intake @ 28" .800 (all they give you from Dart) 369 cfm.

    Truth:
    Left/right/ex

    .2 140/141/111
    .3 207/207/151
    .4 271/271/192
    .5 322/312/227
    .6 351/329/254
    .7 365/329/271
    .8 341/335/281

    The left port is not a mis-print. Very disappointing.

    Next: AFR 305 as-cast, assembled from AFR with their valves, 2.25 intake with backcut (angle unknown) AFR 1.88 exhaust.

    AFR as-cast advertised:
    right/ex

    .2 154/131
    .3 223/176
    .4 287/219
    .5 335/251
    .6 363/276
    .7---------

    Truth:

    right/left/ex

    .2 146/143/109
    .3 209/210/144
    .4 268/276/185
    .5 324/327/223
    .6 366/336/250
    .7 361/343/262
    .8 ---/345/271

    The bowls are nicely CNC blended but transition from the seat to the chamber is terrible. The exhaust port I believe suffers far worse because of this than the intake.

    http://www.superchevy.com/how-to/engine ... w-testing/

    http://www.superchevy.com/how-to/engine ... omparison/


    O.M.E. BBC Heads


    330864.....68-84...oval...OPEN...396, 402, 366T,
    427T, 454 Truck
    330865.....68-84...oval...OPEN...396, 402, 366T,
    427T, 454 Truck
    330866.....68-78...oval...OPEN...366T, 427T
    330867.....68-73...oval...OPEN...427T
    336765.....68-78...oval...OPEN...427T
    336768.....73-76...oval...OPEN...427T
    336781.....73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports
    343771.....68-86...oval...OPEN...366T, 427T, 454
    343772.....68-86...oval...OPEN...366T, 427T, 454
    343783.....70-76...oval...OPEN...454 Truck
    346236.....75-87...oval...OPEN...454, 120cc chamber, 225/116cc ports
    352625.....70-76...oval...OPEN...454 Truck
    353049.....73-84...oval...OPEN...454, 122cc chamber, 255/119cc ports
    366765.....74-78...oval...OPEN...427T
    473328.....68-69...oval...OPEN...366T
    3856206....65-66...oval..CLOSED..396, 97cc chamber
    3856208....65......rect..CLOSED..396/425hp, 109cc chamber
    396/375hp "Z-16" Chevelle
    3856213....66-82...oval..CLOSED..366T, 427T
    3856260....68......oval..CLOSED..396 Truck
    3872702....65-66...oval..CLOSED..396, 427, 98cc chamber
    3873858....65-67...rect..CLOSED..396, 427, 109cc chamber
    3876875....77-85...oval...OPEN...427T
    3904390....67......oval..CLOSED..396, 427, 98cc chamber
    3904391....67......rect..CLOSED..396, 427, 107cc chamber
    3904392....67......rect..CLOSED..427, Aluminum, L88, L89, 107cc chamber
    3904393....68-76...oval...OPEN...366T
    3908952....67......oval...OPEN...427, "M.Truck", Marine
    3909802....67......oval..CLOSED..396, 427, 101cc chamber
    3917215....67-68...oval..CLOSED..396, 427, 101cc chamber
    3917219....68-85...oval...OPEN...366T, 427T
    3919840....67-69...rect..CLOSED..396, 427, 107cc chamber
    3919842....68-69...rect..CLOSED..396, 427, Aluminum L88, L89, 107cc chamber
    3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber
    3933148....69-84...oval...OPEN...'69 396/265hp, 366T, 427T, 112cc chamber
    3933149....68-76...oval...OPEN...427T, 122cc chamber
    3935401....68-76...oval...OPEN...427T
    3946074....69&71...rect...OPEN...'69 427 L88, ZL1, Aluminum, 118cc chamber
    '71 454 LS6, "round exhaust port"
    3964290....69-70...oval..CLOSED..396, 402, 427, 454, 101cc chamber
    Large or small hex spark
    plugs used
    3964291....69-72...rect..CLOSED..396, 402, 427, 454, 109cc chamber, Large or small hex spark plugs used, crate motor usage in years after 1970.
    3965198....68-69...oval..CLOSED..396 Truck
    3975950....68-70...oval...OPEN...396, 402 Truck, 366T, 427T
    3986133....68-85...oval...OPEN...366T, 427T, 454 Truck
    3986135....69-73...oval...OPEN...366T, 427T
    3986136....68-84...oval...OPEN...366T, 427T, 454 Truck
    3993820....71......oval...OPEN...402, 113cc chamber, 255/114 ports
    3993820....71-84...oval...OPEN...454 Passenger and Trucks, 113cc chamber, 255/114 ports
    3994026....71......rect...OPEN...454 LS6, 118cc chamber
    3999241....72......oval...OPEN...402, 454, 113cc chamber

    6272292....70-78...oval...OPEN...402, 454
    6272990....70-up...rect...OPEN...454 service replacement, used on some MKIV crate engines, 118cc chamber
    10045427...........rect..........Pontiac/Chevy Aluminum, 91cc chamber
    Large Port, race
    10049875...........rect..........Pontiac/Chevy Aluminum
    Small port, race
    10051128...........rect..........Bowtie, Aluminum 72cc chambers
    Symmetrical ports
    10051129...........rect..........Bowtie, Aluminum "raw"
    casting, Symmetrical ports
    10052902...........oval...OPEN...MkIV, 427T
    10101140...91-up...oval..CLOSED..Gen.V 366T, 427T
    10114156...91-up...oval...OPEN...Gen.V & VI 454, 118cc chamber
    10141279...96-up...oval..CLOSED.."Vortec 7400", 100cc chambers
    10487052...77-90...oval...OPEN...366T
    12363391...96-up...oval...OPEN...Bowtie, Aluminum, Signature
    Series, fits MKIV, Gen.V, Gen.VI, 110cc chamber
    12363401...96-up...rect...OPEN...Bowtie, Aluminum, Signature
    Series, fits MKIV, Gen.V, Gen.VI, 118cc chamber
    12558162...01-up...oval..CLOSED..Gen.VII,"Vortec 8100", 8.1L, 496, truck
    12560241...98-up...oval..CLOSED.."Vortec 7400", 100cc chambers
    12562932...91-95...oval...OPEN...Gen.V, truck crate motor, 118cc chambers
    12562933...91-95...oval...OPEN...Gen.V, 118cc chambers
    12562934...00-up...rect...OPEN...Gen.VI 502 Marine
    14011077...69-up...rect...OPEN...Aluminum, fits MKIV, "C-port"
    118cc chamber, also sold as a "solid" head
    14044861...84-96...rect..........Bowtie, Aluminum, MkIV,
    "raised runners", 1st design, 105cc chamber
    14044861...96-up...rect..........Bowtie, Aluminum, Signature
    Series, fits MKIV, Gen.V, Gen.VI
    "raised runners", 2nd design, 115cc chamber
    14044861...84-96...rect..........Bowtie, Aluminum, MkIV
    "raw" casting of "861" MKIV
    1st design
    14081045...78-87...oval...OPEN...454
    14081052...85-87...oval...OPEN...366T, 427T, 454 Truck, Marked "HiPerf"
    14092359...86-90...oval...OPEN...366T, 427T, Marked "HiPerf"
    14092360...86-90...oval...OPEN...454 Truck, "peanut" round ports
    14096188...70-71...rect...OPEN...454 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber
    14097088...91-up...rect...OPEN...Gen.V 454/502 HO, 118cc chamber
    24502585...97......rect..........Olds/Chevy, DRCE 2,
    Pro Stock aluminum, for blocks w/4.900" bore spacing
    25534404...04......rect..........Olds/Chevy, DRCE 3, Pro Stock, aluminum, for blocks with 4.900" bore spacing

    T = Tall deck
    Oval includes both "peanut" (also called "round") ports and large oval ports
     
    Last edited by a moderator: Jun 29, 2017
  8. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.dragzine.com/tech-stories/en ... nder-2000/

    BUDGET HEADS


    Dart 308cc Big Block Chevy Heads, Rectangular Port

    Dart 308 cast iron cylinder head.

    Perfect for: Entry Level Street or Street/Strip where front end weight is not an issue.
    Material: Cast Iron Alloy
    Cost: $1,700 per set
    Intake Runner: 308cc
    Combustion Chamber: Heart Shaped, 121 cc

    Additional Specs:
    Part Number: 15100111
    Intake Port Shape: Rectangular
    Intake Runner Volume: 308cc
    Exhaust Runner Volume: 129 cc
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.250″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.660″
    Springs Per Valve: Single
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV(1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    Edelbrock E Street 290 (#50459)

    Perfect for: Entry Level Street or Street/Strip
    Material: Aluminum
    Cost: $1,725 per set
    Intake Runner: 290 cc
    Combustion Chamber: Proprietary Semi Open Style, 110 cc

    Additional Specs:
    Part Number: 50459
    Intake Port Shape: Oval
    Intake Runner Volume: 290 cc
    Exhaust Runner Volume: 110 cc
    Exhaust Port Shape: D-Port
    Intake Valve Diameter: 2.190″
    Intake Valve Angle: 26°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 26°
    Maximum Valve Lift: 0.700″
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1965-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV(1963), 427 ci Mark IV(1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995)


    Patriot Performance Freedom Series (#2211)

    Perfect for: Entry Level Street or Street/Strip
    Material: Aluminum
    Cost: $1,400 per set
    Intake Runner: 320 cc
    Combustion Chamber: Proprietary, 119 cc

    Additional Specs:
    Part Number 2211
    Intake Port Shape: Rectangular
    Intake Runner Volume: 320 cc
    Exhaust Runner Volume: 125 cc
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.250″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.600″
    Springs Per Valve: hydraulic roller springs
    Retainer Locks: 7°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Priced around $1,400 per set
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    Summit Racing Cast Iron (#SUM-152125)

    Perfect for: Entry Level Street or Street/Strip
    Material: Cast Iron
    Cost: $1,500 per set
    Intake Runner: 308cc
    Combustion Chamber: Heart shaped 119 cc

    Additional Specs:
    Part Number: SUM-152125
    Intake Port Shape: Rectangular
    Intake Runner Volume: 308cc
    Exhaust Runner Volume: 129 cc
    Exhaust Port Shape: Square
    Intake Valve Diameter: 2.250″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.660″
    Springs Per Valve: Single
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1965-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995)


    Trick Flow Specialties PowerOval 280


    Perfect for: Entry Level Street or Street/Strip
    Material: Aluminum
    Cost: $1,850 per set
    Intake Runner: 280 cc
    Combustion Chamber: Open Chamber 113 cc

    Additional Specs:
    Part Number: TFS-41300001 / TFS-41300002
    Intake Port Shape: Oval
    Exhaust Runner Volume: 137 cc
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.190″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.700″
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)
     
  9. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.dragzine.com/tech-stories/en ... nder-2000/
    World Products Merlin Oval Port Iron Heads

    Perfect for: Entry Level Street or Street/Strip
    Material: Cast Iron
    Cost: $1,675 per set
    Intake Runner: 269 cc
    Combustion Chamber: Open Chamber 119 cc

    World Products Merlin Oval Port Iron Heads.
    Additional Specs:
    Part Number: 030040-1 (Hydraulic Flat Tappet)/ 030040-2 (Solid Flat Tappet and Hydraulic Roller)
    Intake Port Shape: Oval
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.300″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.600″
    Springs Per Valve: 030040-1: Single. 030040-2: Dual
    Retainer Locks: 7°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    Dart 345 cast iron cylinder heads


    Perfect for: Street Performance
    Material: Cast Iron
    Cost: $1,800 per set
    Intake Runner: 345 cc
    Combustion Chamber: Heart Shaped 121 cc

    Dart 345 cast iron cylinder head.

    Additional Specs:
    Part Number: 15200132
    Intake Port Shape: Rectangular
    Exhaust Runner Volume: 129 cc
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.300″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.660″
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV(1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    Edelbrock Performer 454-O

    Perfect for: Street Performance
    Material: Aluminum
    Cost: $1,900 per set
    Intake Runner: 290 cc
    Combustion Chamber: Proprietary Semi Open Style 110 cc

    Additional Specs:
    Part Number: 60479
    Intake Port Shape: Oval
    Exhaust Runner Volume: 110 cc
    Exhaust Port Shape: Square
    Intake Valve Diameter: 2.190″
    Intake Valve Angle: 26°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 26°
    Maximum Valve Lift: 0.700″
    Springs Per Valve: Single
    Retainer Locks: 7°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    RHS Pro Action 320 cc Hydraulic Roller

    Perfect for: Street Performance
    Material: Cast Iron
    Cost: $1,575 per set
    Intake Runner: 320 cc
    Combustion Chamber: Proprietary Modified 119 cc

    RHS Pro Action 320 Hydraulic Roller cast iron cylinder head.
    Additional Specs:
    Part Number: 11301-02
    Intake Port Shape: Rectangular
    Exhaust Runner Volume: 135 cc
    Exhaust Port Shape: Rectangular
    Intake Valve Diameter: 2.250″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.600″
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1965-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV(1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    World Products Merlin Rectangular Port Iron Heads

    Perfect for: Street Performance
    Material: Cast Iron
    Cost: $1,675
    Intake Runner: 320 cc
    Combustion Chamber: Open Chamber 119 cc

    Additional Specs:
    Part Number: 030620-2 (Solid Flat Tappet & Hydraulic Roller)/ 030620-3 (Solid Roller)
    Intake Port Shape: Rectangular
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.300″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 030620-2: 0.650″ / 030620-3: 0.700″
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    Edelbrock High Compression 454-O (#60499) 50 state legal


    Perfect for: Wild Street Performance or Dedicated Performance
    Material: Aluminum
    Cost: $1,900 per set
    Intake Runner: 290 cc
    Combustion Chamber: Proprietary Semi Open Style 100 cc

    Additional Specs:
    Part Number: 60499
    Intake Port Shape: Oval
    Exhaust Runner Volume: 110 cc
    Exhaust Port Shape: Square
    Intake Valve Diameter: 2.190″
    Intake Valve Angle: 26°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 26°
    Maximum Valve Lift: 0.700″
    Springs Per Valve: Single
    Retainer Locks: 7°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)

    Trick Flow Specialties PowerPort 320

    Perfect for: Wild Street Performance or Dedicated Performance
    Material: Aluminum
    Cost: $1,950 per set
    Intake Runner: 320 cc
    Combustion Chamber: Open Chamber 122 cc

    Additional Specs:
    Part Number: TFS-41400001 or TFS-41400002
    Intake Port Shape: Rectangular
    Exhaust Runner Volume: 137 cc
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.250″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.700″
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-200

    Patriot Performance Freedom Series (#2216)

    Patriot Performance Freedom Series 2216 aluminum cylinder heads.

    Perfect for: Wild Street Performance or Dedicated Performance
    Material: Aluminum
    Cost: $1,900 per set
    Intake Runner: 320 cc
    Combustion Chamber: Proprietary 119 cc

    Additional Specs:
    Part Number: 2216
    Intake Port Shape: Rectangular
    Exhaust Runner Volume: 125 cc
    Exhaust Port Shape: Round
    Intake Valve Diameter: 2.300″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.800″
    Springs Per Valve: Triple
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1966-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV (1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    (1991-1995), 454 ci Gen VI (1996-2000)

    RHS Pro Action 320 cc Solid Roller

    RHS Pro Action 320 cc Solid Roller cast iron cylinder head.

    Perfect for: Wild Street Performance or Dedicated Performance
    Material: Aluminum
    Cost: $1,780 per set
    Intake Runner: 320 cc
    Combustion Chamber: Proprietary 119 cc

    Additional Specs:
    Part Number: 11301-03
    Intake Port Shape: Rectangular
    Exhaust Runner Volume: 135 cc
    Exhaust Port Shape: Rectangular
    Intake Valve Diameter: 2.250″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.750″
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1965-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV(1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)


    RHS Pro Action 360 cc

    Perfect for: Wild Street Performance or Dedicated Performance
    Material: Cast Iron
    Cost: $1,780 per set
    Intake Runner: 360 cc
    Combustion Chamber: Proprietary 119 cc

    Additional Specs:
    Part Number: 11302-02 (Hydraulic Roller)or 11302-03 (Solid Roller)
    Intake Port Shape: Rectangular
    Exhaust Runner Volume: 135 cc
    Exhaust Port Shape: Rectangular
    Intake Valve Diameter: 2.300″
    Intake Valve Angle: 24°
    Exhaust Valve Diameter: 1.880″
    Exhaust Valve Angle: 15°
    Maximum Valve Lift: 0.600″ (11302-02) / 0.750″ (11302-03)
    Springs Per Valve: Dual
    Retainer Locks: 10°
    Valve Train: Standard BBC 7/16” Stud Mount
    Guideplates: Hardened Steel, 3/8″ Pushrod size
    Application: 396 ci Mark IV (1965-1970), 402 ci Mark IV (1970-1972), 427 ci Mark IV(1966-1969), 454 ci Mark IV (1970-1990), 454 ci Gen V (1991-1995), 454 ci Gen VI (1996-2000)
     
  10. grumpyvette

    grumpyvette Administrator Staff Member

  11. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.raceflowdevelopment.com/RFD- ... dartBC.htm
    if your wallet can handle it heres some rather amazing BBC HEADS....well maybe if I win the lotto and after paying all my bills and my kids bills...and setting up a few trust funds and donating to a few charities...

    [​IMG]
     
  12. Indycars

    Indycars Administrator Staff Member

    Ouch !!!........that much for a bare head....wow.
     
  13. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.rehermorrison.com/rmComponents.htm
    This aluminum head can only be purchased from Reher-Morrison. It is a true proprietary cylinder head design exclusive to Reher-Morrison. It is like no other spread port head on the market. Works great with Nitrous! This is not the same as any other 12 degree on the market.

    The Raptor is a break-through in BBC spread port cylinder head development. Raptor cylinder heads are designed by Reher-Morrison and contain features and benefits not found in any other spread port heads. These are cutting-edge Pro Stock style intake ports utilizing High velocity/Wet flow technology found in no other Big Block Chevy head on the market today! With over two years in development Reher-Morrison has created a cylinder head capable of producing more power in a Big Block Chevy than was previously possible. These heads are featured in the RMRE Super Series 12° 565, 588, 622, and 665.

    The Raptor components include:

    Reher-Morrison 12° Raptor BBC Cylinder Heads
    1.645" O.D. Triple Pacaloy Springs
    10° Manley Titanium Retainers
    10° Heat-Treated Comp Cams Valve Locks
    Manley 2.450"/1.850" Custom Titanium Valves
    423+cfm @.500"/525cfm @.800"/535cfm @.900"/540cfm @1"
    Flows more air per valve size than any other spread port cylinder head!
    65cc Chambers 465cc Intake Ports
    Variable valve sizes available for specific applications, 2.450"/1.850" standard
    Uses standard BBC spread port cylinder head components, less costly to update!
    Faster throttle response when using a throttle stop
    Broader horsepower and torque curve than other BBC spread port cylinder heads
    More potential horsepower per dollar than any other BBC cylinder head
    Provides the next level of BBC performance for nitrous, blown or naturally aspirated applications

    Available exclusively from Reher-Morrison!

    Price: $6,895.00 - Call to order!

    http://www.popularhotrodding.com/tech/0 ... to_06.html

    http://www.enginebuildermag.com/Article ... gines.aspx

    http://www.enginebuildermag.com/Article ... pdate.aspx

    http://www.aera.org/engine-professional ... echnology/

    http://www.precisionenginetech.com/tech ... ns-part-2/
     
  14. grumpyvette

    grumpyvette Administrator Staff Member

    AFR new 300 oval port heads

    AIR FLOW RESEARCH has come out with a new large oval port head thats sized to match the street/strip use of a 477-509 displacement big block to maximize mid and upper mid rpm torque and power, this should be a good choice on a street driven performance application.

    [​IMG]
    Chris Sperling who handles most of our IT/catalog/website is at IMIS working the tradeshow so Im having a hard time getting the PDF of the flowcurve we have printed in our 2013 catalog so in the meantime I will just post the numbers here and update this thread at a later date with the better looking "official" flow chart when I have access to that....either way its the information you guys are in search of and justifiably so

    These figures are taken on a "real world" 4.310 bore fixture (they would have looked even stronger on a 4.500 or 4.600 bore) and the exhaust is tested with a curved 2" pipe that very much resembles a header (the catalog shows 1.875 which is incorrect....just an FYI). Intake port flowed with a proper fitting radius plate of course (3/4 radius).

    Intake Flow

    .200....165
    .300....240
    .400....296
    .500....340
    .600....378
    .650....385
    .700....388

    Exhaust Flow

    .200....135
    .300....190
    .400....234
    .500....265
    .600....280
    .650....288
    .700....295


    Note these numbers are conservative if anything....my prototype goes almost 10 CFM more than this and we wanted to sandbag a little to cover tool life and stacking of tolerances (a few thou) on the CNC machines. Even CNC machines can produce slightly different results from head to head / machine to machine, but if you stay on top of tool life and fixture locations, the repeatability is very impressive. To be honest, it's an art form we are in a continuous state of improving (something we tend to hyper focus on) and we have made huge strides in that aspect of our business in the 11 or so years I have been here to witness and be part of. What only a few years ago might have been "acceptable" now isn't....we constantly try to push ourselves to higher standards and the quality of what we ship has never looked better.

    Anyway....when I have a chance I will grab some pics of the 300 Roval when the heads from IMIS come back and at some point update this post with the "official" AFR flow chart from the catalog but if you have seen an AFR 290 up close and personal it looks extremely similar with the most glaring difference the slight increase in valve size from 2.250 to 2.300

    Regards,
    Tony
     
  15. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.dragzine.com/news/new-produc ... der-heads/

    Edelbrock’s New RPM Xtreme Big Block Chevy Cylinder Heads
    by Ian McBride on June 3, 2010


    Edelbrock has developed a new set of cylinder heads for 427-572 cid Big Block Chevy engines named ‘RPM Xtreme Cylinder Heads.’ The heads produce flow numbers competitive with the Victor series race heads, but they still maintain compatibility with off-the-shelve components. The rectangular port heads are available with a larger chamber for forced induction and pump gas motors.

    Official Release:

    The new Edelbrock RPM Xtreme Cylinder Heads for 427 – 572 cid Big Block Chevy engines strive to provide race level performance in a streetable design envelope. CNC machined runners and combustion chambers achieve flow numbers nearly on par with the Victor series professional race head, while maintaining compatibility with off-the-shelf or even stock components including headers, pistons and rocker arms. The deck has been rolled 1.5° to improve the intake valve angle and consequently port velocity, while ensuring that the 2.25″ (oval) / 2.30″ (rect.) intake and 1.88″ exhaust valves will still clear the factory valve reliefs. The exhaust flange has been raised less than 1/8″ to improve flow around the short turn without causing conflicts with off-the-shelf 2″ primary tube headers designed to work with stock heads. The 300cc (oval) / 325cc (rect.) intake ports and 110cc chamber volumes will ensure that the performance potential of these heads is sufficient for nearly any street driven application. The rectangular port heads are even available with a larger 118cc chamber to support forced induction and pump gas friendly compression ratios.

    Rectangle port RPM XT heads #51559 testing on a 555 cubic inch big-block Chevy with 10.0:1 compression, hydraulic roller camshaft [248°/256° duration @ .050] and Edelbrock RPM XT EFI system produced 697 HP and 643 lbs./ft. of torque.

    Edelbrock aluminum cylinder heads are sand cast at our private foundry in San Jacinto, CA and are hand assembled at our Torrance, CA headquarters. They carry a one year warranty against any manufacturer defects, and are sold complete with valves, springs and guides pre-installed. Installation is the same as factory cylinder heads, making this an easy bolt-on upgrade with results you will feel on every pull.

    Features Include:

    CNC ported combustion chambers, intake and exhaust runners improve air-flow and performance
    Fully CNC machined combustion chambers
    25-degree valve angle
    5/8″ thick deck for extreme durability
    Outstanding flow; up to 385 cfm (rectangle port) and up to 356 cfm (oval port)
    RPM XT heads accept most stock port location exhaust headers
     
  16. grumpyvette

    grumpyvette Administrator Staff Member

    http://www.superchevy.com/technical/eng ... ewall.html

    Ask a big-block enthusiast what they need to make 600 hp and chances are they will point to some sort of rectangular-port head. No one in their right mind would select an oval-port head to make that kind of power, let alone one with a diminutive 265cc intake port, right? Well, big-block fans, times have changed and so has that well-defined line between the pedestrian oval-port and rectangular-port performance heads.

    Back in the day, all the factory high-performance Rat motors were sporting rectangular-port heads and the street/strip crowd followed suit. But that was then and this is now. The aftermarket has stepped up in a big way and produced oval-port heads that not only out-flow any factory rectangular-port version, but do so while dramatically reducing port volume. The combination of more flow and less port volume makes these oval-port heads a much better choice for your street/strip motor than their rectangular-port counterparts. For motors up to and even beyond 600 hp, especially small-displacement big-blocks (under 500 inches), the hot setup today is more than likely an aftermarket oval-port.

    With oval-port heads taking the street/strip market by storm, we decided it was a good idea to take a long hard look at them and thoroughly check out the performance potential. This meant gathering a number of different oval-port cylinder heads and putting them through their paces, both on the flow bench and the engine dyno.

    First up, we needed a suitable test motor. We decided on a 0.060-over 454 equipped with a forged crank and forged rods from Procomp Electronics matched to a set of forged pistons from Probe Racing. The pistons feature an 18cc dome to help provide a streetable static compression over 10.0:1 with the 110cc chambers employed on a couple of the oval-port heads.

    Many of these heads offered combustion chamber volumes below the 120cc range used on most rectangular-port heads. The smaller chamber (relative to factory rec-port heads) improved power by increasing the static compression--always a plus. The test motor also featured a healthy hydraulic roller cam in the form of an XR300HR from Comp Cams. It a 0.560/0.580 lift split, a 248/254 duration split, and a 110-degree LSA. All testing was run with an Edelbrock Victor Jr. intake fed by a Holley 950 HP carb.

    Before being run on the engine dyno, each of the heads had to be mocked up to determine not only the appropriate pushrod length, but also the correct head bolt/stud combination. Our 2.25-inch dyno headers presented a problem for the heads equipped with stock port locations and required use of head bolts in the lower holes to provide adequate clearance. A few of the heads required different middle stud lengths, but ARP helped cure the situation. All we had to do was juggle the necessary bolts and studs to properly secure the heads. Thanks also goes out to Fel Pro for supplying the necessary head and intake gaskets for our test.

    The test Rat was finished using a set of hydraulic roller lifters, timing chain, and a couple of different sets of pushrods from Comp Cams. Comp also supplied the aluminum roller rockers (1.7 ratio) for our head shootout.

    The finishing touches included a Milodon oiling system, an electric water pump, and balancer from Procomp Electronics. Prior to their time on the test mill, each head was given the once over on the flow bench, then set up to measure port and chamber volumes.

    The heads supplied for the test shared the oval-port configuration, but that doesn't mean they were all the same. We started with a factory oval-port head to establish a baseline, in this case the peanut-port variety. We hoped to include a traditional oval-port head as well, but it fell through at the last minute.

    The heads from Dart and Procomp Electronics were as-cast with no additional machining of any kind. Heads supplied by Brodix and Trick Flow Specialties both featured port matching, but the Brodix head carried it one step further with CNC work on the combustion chamber. The AFR, Edelbrock, and 049 heads from Dr. Js all combined full porting and chamber work.

    As expected, the level of work applied to the heads resulted in differences in flow and power. Take note that the combustion chamber volumes varied from 110 cc to 121 cc, resulting in a difference in static compression of 1 full point. This alone was worth 3-4 percent in power, so bear this in mind when reviewing the results.

    The one upgrade we would like to see on many of the heads is more valve spring pressure. At the top of the power curve, some suffered slightly due to inadequate spring pressure.

    Power and price usually go hand in hand, but check out the retail prices to determine how your favorite does in the all-important bang-for-the-buck category. Next month, we'll be testing some popular rectangular port heads on a larger-displacement Rat.
    Sucp 1206 005 Oval Port Big Block Chevy Cylinder Heads
    [​IMG]
    Test 1: Chevy Peanut-Port Heads
    [​IMG]
    notice the huge difference in intake runner cross sectional area,between rectangle and peanut port heads
    Our intention was to run a set of stock peanut-port heads and a set of stock oval-port heads, but our oval-port heads fell through. The stock peanut-port heads featured a 2.06/1.72 valve combination with 118cc combustion chambers. Closer inspection revealed that even our "stock" peanut-port heads had been milled sometime in their long life. The small valves, port volume, and flow numbers made them less than ideal with this healthy hydraulic roller cam, but they surprised us by exceeding 500 hp with peak numbers of 512 hp and 514 lb-ft of torque. Looking at the graphs, the peanut-port heads actually ran neck and neck with the aftermarket heads up to 4,500 rpm, which makes them ideal for intended low-speed truck applications. With a little porting, they make good heads for a mild street BBC, especially a small-displacement 396.

    Notes: Out-of-the box 360 castings
    Retail Price- N/A
    Intake Valve Size-2.06
    Exhaust Valve Size-1.72
    Intake port vol-253 cc
    Chamber Volume-117 cc [milled]
    Peak Power-512 @ 5,800 rpm
    Peak Torque-514 lb-ft @ 4,800 rpm
    Avg HP [3,500-6,300]-453.4 hp
    Avg TQ [3,000-6,500]-489.9 lb-ft
    Tq @ 4,000 RPM-508.5 lb-ft

    Flow Data: CFM @ 28-ins
    Lift In EX
    .050 33 24
    .100 57 51
    .200 117 94
    .300 185 128
    .400 233 158
    .500 247 179
    .600 250 297
    .700 250 211
    [​IMG]
    [​IMG]
     
    Last edited by a moderator: Nov 9, 2015
  17. grumpyvette

    grumpyvette Administrator Staff Member

    Test 2: Airflow Research 265

    The AFR 265 heads didnt produce the highest peak power and torque numbers of the test because of peak flow numbers. In fact, every aftermarket head we tested actually offered better flow number numbers at 0.700 lift (and many at 0.600 lift) than the AFRs. Even the ported 049 heads outflowed the AFRs at 0.700 lift, but our 0.580-lift cam never made it to 0.700 lift. Besides, power doesnt come from peak flow, it comes from maximizing flow in the usable lift range. Since the valve must open up to the maximum lift value, then close down, it spends twice as much time in the rest of the lift range as it does at the peak. Using the additional mid-lift flow offered by the AFR 265s, the 468 BBC produced 613 hp and 559 lb-ft of torque. The spring package provided by AFR allowed the hydraulic roller motor to rev cleanly to 6,500 rpm. In terms of average power production from 3,500 rpm to 6,300 rpm, the AFR 265s produced 501 hp and 536 lb-ft of torque, while knocking down 520 lb-ft at 4,000 rpm.
    [​IMG]
    Notes: Fully ported, chambers worked
    Retail Price- $2,238
    Intake Valve Size-2.19
    Exhaust Valve Size-1.88
    Intake port vol-266 cc
    Chamber Volume-112 cc
    Peak Power-612 hp @ 6,400 rpm
    Peak Torque-559 lb-ft @ 5,300 rpm
    Avg HP [3,500-6,500]-501 hp
    Avg TQ [3,500-6,500]-536 lb-ft
    Tq @ 4,000 RPM-520.3 lb-ft

    Flow Data: CFM @ 28-ins
    Lift In EX
    .050 37 30
    .100 73 63
    .200 164 141
    .300 241 196
    .400 298 239
    .500 332 260
    .600 331 273
    .700 316 280
     
    Last edited by a moderator: Nov 9, 2015
  18. grumpyvette

    grumpyvette Administrator Staff Member

    Test 3: Brodix Race Rite Oval 270

    The Brodix Race Rite oval-port heads featured 270cc intake ports that flowed just shy of 340 cfm--enough to support nearly 700 hp on the right application. Obviously, our mild combination could not take full advantage of what the Brodix heads had to offer, but they performed exceptionally well on the 468 nonetheless. Unlike the AFR or Edelbrock offerings, the Brodix Race Rite heads relied on CNC porting only in the combustion chamber. The intake ports received a minor gasket match, but the cutter was not allowed to do any serious work. The lack of CNC porting didnt seem to hurt the flow rates, as the intake and exhaust ports of the Brodix heads flowed 336 cfm and 270 cfm, respectively. This allowed the Brodix-headed 468 to produce 591 hp and 553 lb-ft of torque. The BBC averaged 492 hp and 528 lb-ft of torque while thumping out 512.8 lb-ft at 4,000 rpm.

    Notes: CNC'd comb. chambers, intake ports
    Retail Price- $2,796
    Intake Valve Size-2.25
    Exhaust Valve Size-1.88
    Intake port vol-269 cc
    Chamber Volume-111 cc
    Peak Power-591 hp @ 6,100 rpm
    Peak Torque-553 lb-ft @ 5,100 rpm
    Avg HP [3,500-6,500]-492.7 hp
    Avg TQ [3,500-6,500]-528 lb-ft
    Tq @ 4,000 RPM-512.8 lb-ft

    Flow Data: CFM @ 28-ins
    Lift In EX
    .050 34 30
    .100 69 64
    .200 149 127
    .300 220 163
    .400 275 193
    .500 315 225
    .600 336 254
    .700 333 270


    ID suggest you select from heads from these sources
    Jegs; 800/345-4545; Jegs.com

    Summit Racing; 800/230-3030; SummitRacing.com

    Scoggin-Dickey Parts Center; 800/456-0211; ScogginDickey.com


    TRICKFLOW
    http://www.trickflow.com/egnsearch.asp? ... 4294867081
    http://www.trickflow.com/customerservice
    1-330-630-1555 • 1-888-841-6556

    BRODIX
    http://www.brodix.com/heads/heads.html
    479.394.1075

    DART
    http://www.dartheads.com/products/cylinder-heads
    Dart Machinery; 248/362-1188; DartHeads.com


    AIR FLOW RESEARCH
    http://www.airflowresearch.com/
    toll free: 877-892-8844
    tel: 661-257-8124

    Patriot Performance
    Patriot Performance; 888/462-8276; Patriot-Performance.com


    RHS
    http://www.racingheadservice.com/rhs/cylinder-headshtml
    Toll Free: 877-776-4323
    Local: 901-259-1134

    EDELBROCK
    http://www.edelbrock.com/automotive_new ... main.shtml
    Edelbrock; 310/781-2222; Edelbrock.com

    BMP (world products)
    http://www.theengineshop.com/products/cylinder-heads
    Tel: 631-737-0372
    Fax: 631-737-0467

    BUTLER PERFORMANCE
    http://www.butlerperformance.com/products/cylinder_heads/cylinder_head_labor.html
    866-762-7527

    BLUE PRINT ENGINES
    http://www.blueprintengines.com/ind...sb-chevy-aluminum-cylinder-heads-cnc-machined
    1800-483-4263

    PRO-FILER
    https://www.profilerperformance.com/
    937‐846‐1333
     
    Last edited by a moderator: Sep 3, 2018
  19. grumpyvette

    grumpyvette Administrator Staff Member

    Test 4: Dart Pro 1 270 Oval-Port

    The Pro 1 name from Dart has always meant power and this new 270 oval port cast was no exception. The Pro 1 was one of only two full as-cast heads to be tested. All others featured some sort of CNC porting, chamber work, or port matching. Obviously the designers were earning their money, as despite the virgin aluminum, the as-cast Dart Pro 1 offered impressive flow numbers. It's always easier to improve the flow with porting, but getting the results from a casting takes real talent. With enough airflow to easily support our test motor, the Dart-headed BBC produced 593 hp and 554 lb-ft of torque. The 111cc combustion chamber makes the Dart Pro 1 a perfect candidate for head swapping on a 7.4L truck motor. Yank a wrecking yard mule, stuff in a cam, and ditch the peanut ports in favor of a set of Dart oval ports and you have one serious street motor. The smaller chambers on the Dart head (compared to a typical 119cc chamber on peanut-ports) add both flow and compression to further increase power. The Dart Pro 1s showed the power of oval ports by averaging 494 hp and 529 lb-ft of torque and offering 509 lb-ft of torque at 4,000 rpm.

    Notes: Totally unported, as-cast
    Retail Price- $2,995
    Intake Valve Size-2.25
    Exhaust Valve Size-1.88
    Intake port vol-274 cc
    Chamber Volume-111 cc
    Peak Power-593 hp @ 6,100 rpm
    Peak Torque-554 lb-ft @ 5,300 rpm
    Avg HP [3,500-6,500]-494.0 hp
    Avg TQ [3,500-6,500]-529.0 lb-ft
    Tq @ 4,000 RPM-509.8 lb-ft

    Flow Data: CFM @ 28-ins
    Lift In EX
    .050 36 34
    .100 71 69
    .200 158 117
    .300 235 159
    .400 290 204
    .500 323 234
    .600 324 252
    .700 325 267
     
  20. grumpyvette

    grumpyvette Administrator Staff Member

    Test 5: Dr. J's Ported 049 Oval

    Popularity, availability, and cost all make a factory oval-port head appealing. Because so many enthusiasts not only have heads, but decided to massage them, we opted to include a set of ported 049s in this test. The factory 049 heads came from Dr. J's and were treated to their typical valve upgrade, full porting, and even a slight milling to get the chamber volume down to 118 cc. It is all but impossible to get the chamber size down to the 110cc range offered by the aftermarket heads, but the flow numbers were certainly right in the ballpark. The drop in compression caused by the larger chamber volume hurt power slightly through the entire rev range, but the ported 049s demonstrated why so many BBC owners insist on porting the stock stuff.

    Equipped with the Dr. J heads, the 468 produced 576 hp and 538 lb-ft of torque. Torque production exceeded 515 lb-ft from 4,500 rpm to 5,800 rpm, while the BBC averaged 481 hp and 515.8 lb-ft of torque. Down at 4,000 rpm, the iron-headed big-block produced 504.7 lb-ft of torque. The one problem with iron heads is obviously the weight.

    Notes: Reworked factory heads
    Retail Price- $1,599 (porting customer-supplied castings)
    Intake Valve Size-2.25
    Exhaust Valve Size-1.88
    Intake port vol-267 cc
    Chamber Volume-118 cc
    Peak Power-576 hp @ 6,000 rpm
    Peak Torque-538 lb-ft @ 5,100 rpm
    Avg HP [3,500-6,500]-481.4 hp
    Avg TQ [3,500-6,500]-515.8 lb-ft
    Tq @ 4,000 RPM-504.7 lb-ft

    Lift In EX
    .050 33 34
    .100 73 71
    .200 152 120
    .300 228 162
    .400 282 188
    .500 320 215
    .600 336 238
    .700 329 246
     

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