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.
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/
mark iv blocks
mark v blocks
(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
GEN V and VI
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
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
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
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
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.
AFR 3001 Big Block Chevy 335cc Enforcer Cylinder Heads, Assembled
AFR'S 335cc BBC Enforcer Cylinder heads feature our Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. This budget friendly head is perfect for your 509 to 540...
www.speedwaymotors.com
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/
mark iv blocks
mark v blocks
(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
GEN V and VI
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
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
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
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
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: