BIG BLOCK CHEVY HEADS, PICTURES/INFO

[grumpyvette]

in the AFTERMARKET HEADS.... THERES DECADES OF RESEARCH AND STEADY IMPROVEMENTS IN TECH.

read thru this
http://carcraft.automotive.com/79483/cc ... index.html

How to Build Chevy Big-Blocks: Cylinder Head Guide

How to Build Chevy Big-Blocks: Cylinder Head Guide Includes in-depth instruction and photos. Free in-depth instructional guide.

www.cartechbooks.com

brodix and trickflow have in my opinion,the best looking machine work
dart, profiler ,edelbrock and AFR all come in a close second
some of the other stuff looks like its slapped together by drunk monkeys
Id suggest sticking to those 5 brands
which of the 5 I use depends on the application but BRODIX,AFR,TRICKFLOW. DART,EDELBROCK, in roughly that order for SBC, and TRICKFLOW,AFR,BRODIX,DART,EDELBROCK in roughly that order for BBC I feel are the best value,..I.E. price for what you get,
and obviously you need to research what cylinder head matches the engine build requirement you require

Profiler Performance Products 174-X-C37-04 Pro-Filer Performance Products Big Block Chevy Sniper X Cylinder Heads | Summit Racing

Free Shipping - Pro-Filer Performance Products Big Block Chevy Sniper X Cylinder Heads with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

OPEN VS CLOSED CHAMBER

normal oval ports

MID SIZE OVAL PORT HEADS

MID SIZE VS PEANUT PORT HEADS

http://www.j-performance.com/index.php? ... view&id=28

http://www.profilerperformance.com/specials.html

http://www.airflowresearch.com/17-23.pdf

Thread 'valve seat angles and air flow'

Jan 18, 2013

valve seat angles and the actual angles cut on the valve edges them selfs and how you have the area under the valve in the port bowl area cut and blended has a marked effect on your engines air flow.
for performance use there's lots of tweaks you can use, to boost torque and horsepower,
a chevy V8 engine is basically a machine designed to maximize the use of combustion pressure , generated from a mix of air and fuel ignited and burnt over a piston once it's passed top dead center through a connecting rod connected to a crankshaft
you increase power by increasing the initial volume...

• grumpyvette
• Replies: 26
• Forum: Cams, Heads and Valve Trains

Brodix 2038119: BP BB-3 XTRA 380 Series Cylinder Head CNC Ported - JEGS

Get the Best Performance with Brodix BP BB-3 XTRA 380 Series Cylinder Head CNC Ported 2038119 parts at JEGS. Shop Now at the Guaranteed Lowest Price!

www.jegs.com

Trick Flow Specialties TFS-4141T804-C02 Trick Flow® PowerPort® 365 Cylinder Heads for Big Block Chevrolet | Summit Racing

Free Shipping - Trick Flow® PowerPort® 365 Cylinder Heads for Big Block Chevrolet with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

BTW YOU CAN RUN A RECTANGLE PORT INTAKE ON OVAL PORT HEADS
theres a noticeable port mismatch but IT still works much better than most guys would suspect it might

those PEANUT PORT HEADS are just a bit worse than this, picture of the standard oval port heads with a rectangle gasket
EXHAUST PORTS

315cc BBC Rectangle Port Cylinder Head

Cylinder Head Specialists

www.airflowresearch.com

OPEN CHAMBER COMBUSTION CHAMBERS

DIFFERENCE IN APPEARANCE

Brodix 2038119: BP BB-3 XTRA 380 Series Cylinder Head CNC Ported - JEGS

Get the Best Performance with Brodix BP BB-3 XTRA 380 Series Cylinder Head CNC Ported 2038119 parts at JEGS. Shop Now at the Guaranteed Lowest Price!

www.jegs.com

RECTANGLE PORTS
http://garage.grumpysperformance.co...sue-based-on-mis-information.6414/#post-25995

http://garage.grumpysperformance.co...lock-chevy-heads-pictures-info.410/#post-1907

357cc BBC Rectangle Port Cylinder Head

Cylinder Head Specialists

www.airflowresearch.com

theres some good info in these links (below)

http://www.corvetteclub.org.uk/viewtopic.php?p=48358

http://www.chevyhiperformance.com/techa ... index.html

http://www.airflowresearch.com/17-23.pdf

http://www.amazon.com/Hot-Rod-Horsepowe ... pd_sim_b_3

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

http://www.cferacing.com/products.php?id=4

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

http://www.amazon.com/How-Rebuild-Your- ... 4JRJ6GRMQH

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

 

[grumpyvette]

http://www.airflowresearch.com/articles ... 1/A-P1.htm

well worth reading thru
short answer
most hp per dollar TRICKFLOW at 655hp

unshrouding valves, and polishing combustion chambers

I think you missed my point It was a pun intended towards Skipwhite performance..... Short of the long story Skipwhite performance build a motor for me in 2015 fast forward 2018 They built junk from what I have ran into, Grumpy and the gang have gave me all kinds of advice and help so far...

garage.grumpysperformance.com

Thread 'valve seat angles and air flow'

Jan 18, 2013

valve seat angles and the actual angles cut on the valve edges them selfs and how you have the area under the valve in the port bowl area cut and blended has a marked effect on your engines air flow.
for performance use there's lots of tweaks you can use, to boost torque and horsepower,
a chevy V8 engine is basically a machine designed to maximize the use of combustion pressure , generated from a mix of air and fuel ignited and burnt over a piston once it's passed top dead center through a connecting rod connected to a crankshaft
you increase power by increasing the initial volume...

• grumpyvette
• Replies: 26
• Forum: Cams, Heads and Valve Trains

but things change rapidly and every few months theres always,
going to be other better,(and most likely more expensive options)
most HP, AFR at 665 hp
cheapest EDELBROCK at $1779/633hp

semi fool proof cam sellection

you can start with this, the SIX cam manufacturers POSTED OR LINKED BELOW that have proven to be dependable, the soft ware below might prove useful, so use it to get a base line INFO YOU NEED IF YOUR selecting the correct cam for YOUR combo FIRST!!>>>>>>ANY AND ALL CAM MANUFACTURERS WILL need...

garage.grumpysperformance.com

https://www.airflowresearch.com/cylinder-heads/bbc-magnum-24-cylinder-head/

Pro-Filer Racing Cylinder Heads and Intake Manifolds

State of the Art Cylinder Heads and Intake Manifolds for Racing and Street Performance.

www.profilerperformance.com

Shocker 370 BBC CNC (Sold in Pairs) - PROMAXX Performance Products

The Shocker 370cc full CNC ported is the Big Dog in our BBC line. Its runner will feed your beast, street or strip. Flowing over 450 cfm with a 2.350 valve, this head will support big cubic inches and Big power that will not break the bank and will shock your competition and ours.

promaxxperformance.com

another 496bbc

this thread will contain several totally different engine builds with parts listed and when available the dyno results from the engines built, it will be used as a guide to allow readers to compare the basic engine components , at least a bit too get a good idea as to the components selected and...

garage.grumpysperformance.com

 

[grumpyvette]

BTW THERES LOTS MORE INFO HERE!

Here is an excerpt from an AERA TB,,
===================

Exhaust Valve Guide Caution On
1965-98 GM Big Block Engines

These engines' valve guides were not intended as a replacement item from GM.
The guides were located into the head castings after the head was cast and
the exhaust guide is "water cooled".
The water-cooled guide also has two different size press fit diameters. Adding additional confusion to the matter, they also switched the location of the larger diameter sometime in 1985.

To determine which outside diameter guide you have and which direction to
remove an exhaust valve guide, the following procedure is suggested:

Drive the guide no more than .250" (6.35 mm) toward the valve spring side of
the head and stop. Then, measure the newly exposed area of the guide
OD next to the spring pad.

If the measurement is .620" it is the first style guide. To remove this
style guide, continue driving it toward the valve spring side of the head.

If the measurement is .616" , it is the second style guide. To remove
this style guide, you must drive it the opposite direction toward the combustion
chamber side of the head.
DARTS NEW PRO 2 HEADS

Pro2 | Dart Machinery

dartheads.com

 

[grumpyvette]

Some factors I don,t see discussed in this ENDLESS DEBATE over OVAL vs REC port heads.
is that BOTH the intake cross section and exhaust length & dia. effect the engine tuning and must match the cams lift and the engines compression, ratio (WHICH RARELY SEEMS TO HAPPEN) and all that must match the drive trains gearing so the engine operates in its intended rpm band, and that theres a WORLD of difference between the better aftermarket heads and most reworked Chevy cast heads , in flow potential.
Id also point out that theres a huge difference in flow potential and airflow port speeds between, the average factory dual plane intakes and the best race design single plane intakes, and their intended operational rpm bands differ significantly also.
I build at least 5 big block Chevy for each sbc I build and IM constantly amazed at the MIS-matched engine combos I see guys put together that they expect to run correctly.
you can,t reasonably expect a rectangle port to reach its potential with a cam that has under approximately .600-.650 lift MINIMUM or a duration much under about 245-250degs. at .050 lift and depending on the LCA that means the cpr is going to need to be above about 10:1-11:1, and depending on the displacement and stroke you'll want to keep that combo spinning in the 3700-4500 fpm in piston speed,which requires a matching rear gear ratio and stall speed. yet I constantly see combos that don,t meet the minimums that will effectively USE the rectangle ports head flow characteristics.
OVAL ports are generally designed to maximize the mid rpm torque band, and while theres a great deal of overlap between the larger oval port heads and the smaller rectangle port heads in thier flow potential and basic rpm bands, youll generally find the rectangle port heads work better in larger displacements and at higher average rpms.

ITS THE TOTAL COMBO, NOT just the HEADS, THE BEST HEADS WON,T WORK worth,$#$%^& matched to components that are not designed to MATCH their full potential, or operate in thier designed rpm band and compression ratio, and use matching cam timing and lift to the intended application.
stick a comparatively mild cam in a lower compression combo and then blaming the larger performance HEADS is like trying to race with your ignition timing off by 10 degrees and the jets in your carb 6 sizes too rich/lean.

when buying common off the shelf performance BBC heads
ID suggest sticking with

TRICKFLOW
AIR FLOW RESEARCH
BRODIX
DART
EDELBROCK
PROFILER


IVE seen several imported head castings that needed extensive re-working to get them correct, not much sence in saving $400-$800 on heads if they then REQUIRE an additional $700-$1200 to get them to work correctly in machine work and new parts.

this info below might help, and like always reading the info, in the links and sub links, takes time but youll be far better off in the long run if you take the effort to do so

Lukovich Racing Engines - Cylinder Heads, Intake Manifolds & Induction Kits

Sniper Big Block Chevy Single Plane Intake Manifold | Pro-Filer

Sniper Big Block Chevy Conventional Port Racing Intake Manifold by Pro-Filer Performance 206 Series

www.profilerperformance.com

VICTOR 454R PLENUM

PRO-FILER SNIPER II PLENUM

 

[grumpyvette]

AFR 290 oval port, 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 the same flow 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

 

[Michael]

AFR's oval-port heads are a relatively new product. I was shopping for aluminum oval-port BBC heads a few years ago, and Tony Mamo at AFR told me that there was "no business case for a high-end oval port head; most guys with the wherewithal to invest in good BBC heads are probably running a 496+ engine anyway, and they need a 300+ cc rectangle-port head".

So instead I bought Brodix "Race Rite" ovals - around 270cc, if I recall correctly. They flow nearly as well as AFR's new oval port heads, on the intake side. They're worse on the exhaust side, because Brodix, unlike AFR, don't raise their exhaust port location (AFR is +0.300", I think).

My RR's came "semi CNC finished", with CNC chambers and porting from the flange face around 0.75" into the ports. I used a Dremel and high-speed cutting stones to smooth the transition where the CNC porting ends, and cleaned up the ridge on the exhaust-port short side radius (it was pretty bad in a few cases); maybe 1 hour of work. I do not have flow bench numbers, but remain optimistic.

My application is a 0.030"-over 454 with nearly stock bottom end, mild mechanical roller cam, dual-plane intake and fairly restrictive exhaust; it's not really demanding of the cylinder head flow. So the lower flow numbers of Brodix vs. AFR are probably more than overcome by the smaller port volume (hopefully higher flow speed!) of the Brodix heads.

I profiled my cam (lift vs. crank angle numbers for all 720 degrees, intake and exhaust). Would it be violating a trade secret if I posted the numbers here?

 

[grumpyvette]

just as a tip, if your looking for moderately priced aluminum oval port BBC heads
you might want to look over these also

http://www.summitracing.com/parts/TFS-41300001/?rtype=5

http://static.summitracing.com/global/i ... %20280.pdf

http://static.summitracing.com/global/i ... %20280.pdf

these patriot rectangle port BBC heads are rather new Ive yet to see a set of the newer updated version so until I do , Ill remain hopeful but cautious
https://www.patriot-performance.com/xca ... oductid=15

Complete Cylinder Heads Guide for Big-Block Chevy Engines​

Induction Systems for Building Big-Block Chevy Engines - Covers how to build 396 to 572 ci Chevy Big-Block Engines Step-by-Step
www.cartechbooks.com

as with most technology, there's a rapid ongoing improvement in what parts are available,
what the components can accomplish, what other matched parts must be used, and as usual the cost is always going upwards.
Our Freedom Series heads have started a revolution in the performance world. We have custom designed a head to meet the demands of the BBC world, while keeping the quality high and the price reasonable. Our BBC heads come as cast with a 320cc intake runner, US made bronze guides, and our 5 angle valve job. Chevy High Performance used these to build their 675 hp 496 in their Jan. 2008 issue. These heads come standard with a 119cc chamber, assembled in our facility with 21-4N stainless 2.250" / 1.880" valves, .600" hydraulic roller springs, steel retainers, 7/16" studs, guide plates, and viton seals.

Sold as Pair.


Technical Specs:

Combustion Chamber: 119cc
Intake Runner: 320cc
Exhaust Runner: cc
Intake Valve: 2.250"
Exhaust Valve: 1.880"
Max. Valve Spring Lift: 0.600"
Spring Pressure Closed: 135 lbs. @ 2.000"
Spring Pressure Open: 375 lbs @ 1.400"
Retainer Material: Steel
Valve Seal Material: Viton
Valve Guide Material: Manganese Bronze
Valve Job: 5-angle

91.00 lbs
Price: $1395.00

 

[Grumpy]

 

[Grumpy]

24° Magnum

Shop 24° Magnum Parts

www.airflowresearch.com

calculate fuel injector size

https://www.corvettemods.com/C4-C5-Corvette-1985-2004-Fuel-Injectors---Set-of-8---96lbhr---1000cc_p_17958.html?gclid=EAIaIQobChMIq8HDsqO69gIVoQaKAx1uHwGmEAEYASABEgKWQPD_BwE be sure you calculate the correct size injector and be sure you order the correct size injectors you need be sure to...

garage.grumpysperformance.com

you'll obviously need a 1000 cfm throttle body and injectors matching the intended displacement ,compression ratio, rpm and intended power range to get the best results,
if you think the 265cc AFR BBC heads perk up an engine, you have to try the 300cc AFR versions,
I've read more than a few dyno tests showing the results are very noticeably favoring the marginally larger port size especially if matched to a roller cam with at least 245 degrees of intake duration at .050 lift and at least 10.5:1 compression,
this seems to be especially true on 468 cid and larger displacement engines

300cc BBC Oval Port Cylinder Head

Cylinder Head Specialists

www.airflowresearch.com

300cc Competition Flow Chart
	.200	.300	.400	.500	.550	.600	.650	.700
Int	161	238	298	342	359	374	384	388
Exh	139	191	234	266	275	289	294	298

big block chevy info

the real basics, (off ebays site)------------------------------------------------------------------------------- " This guide is intended to help you sort out the more major differences among Big Block Chevrolet engines produced since 1958. Chevrolet has designed and produced several different...

garage.grumpysperformance.com

265cc BBC Oval Port Cylinder Head

Cylinder Head Specialists

www.airflowresearch.com

Bbc Related & Links And Useful Info

a few useful links, and sub links videos, and tips to look over yeah, increased displacement helps and building a killer BBC old school, for your car can be both cost effective and produce impressive results some of the most effective, cost per hp and efficient combo's , will be the 496...

garage.grumpysperformance.com

http://garage.grumpysperformance.co...-calculators-and-basic-math.10705/#post-72061

http://garage.grumpysperformance.com/index.php?threads/big-block-chevy-info.710/#post-990

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

 

[Grumpy]

this is a rather interesting, video,
but again do extensive research before spending your money
the quality of the components and machine work,
components like valves and valve springs, retainers,keepers etc ALL MATTER

 

[Grumpy]

 

[Grumpy]

Pro-Filer Racing Cylinder Heads and Intake Manifolds

State of the Art Cylinder Heads and Intake Manifolds for Racing and Street Performance.

www.profilerperformance.com

listed at roughly $3200 per pair BARE

keep in mind the price is without the valve train components
you'll easily drop an added $1900 -to-$2500 plus
in valves, valve springs,pushrod guide plates, keepers and a valve train girdle, rockers retainers etc.
getting bare heads completed
yeah, unfortunately this hobby is close to BEING a bottomless money pit,
if you do things correctly and use the better quality parts.. and use of lower quality parts
usually results in catastrophic parts failures, under hard use.
https://www.profilerperformance.com/products/sniper-x-24-cnc-machined-bbc-cylinder-heads-375cc

a marginally different profiler BBC head

Profiler Performance Products 174-X-C37-04 Pro-Filer Performance Products Big Block Chevy Sniper X Cylinder Heads | Summit Racing

Free Shipping - Pro-Filer Performance Products Big Block Chevy Sniper X Cylinder Heads with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

roughly $6300 a pair with much of the valve train included

 

[Grumpy]

heres some info on less expensive bbc head options

 

[Grumpy]

 

[Grumpy]

https://www.motortrend.com/how-to/gm-rsx-zz632-big-block-cylinder-heads/

A Closer Look at Chevy's RS-X Heads

When Chevrolet Performance released the ZZ632 Big Block earlier this year, they included a new style of cylinder head that is closely related to the LS platform.

www.enginelabs.com

https://www.motortrend.com/how-to/gm-rsx-zz632-big-block-cylinder-heads/

1965-1990 Chevy 10051128 Alum Big Block Pro Stock High Runner Semi-Finished Head | eBay

It has 4 evenly spaced intake runners. Minumun port wall thickness id. 240" and round exhaust runners are 1.150" higher than production port location. Always check your specific application for proper fit before buying and see our pictures for specific details.

www.ebay.com

1965-1990 Chevy 10051128 Alum Big Block Pro Stock High Runner Semi-Finished Head | Tracy Performance Corvette Sales, Parts and Service

This is for 1 (ONE) New Chevrolet Chevy Aluminum Symmetrical Bow Tie Pro Stock Semi-Finished Big Block Bare Head (GM Part Number 10051128, GM Group Number 0.269) for 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990...

store.tracyperf.com

bare UN MACHINED HEAD CASTINGS -$999 each

CID Symmetrical Port Big Block Chevy Cylinder Heads

At CID we wanted to address the issues associated with the factory BBC heads. First of all we wanted to make our head a symmetrical port head. No more left and right unequal length runners. We straightened up the valve angles to move away from the factory bath tub chambers and to a smaller more...

www.cidheads.com

with rockers, valves, valve springs etc. and machine work your WAY over $6k a pair for a set ready to run

now this is impressive!

my wallets over in the corner whimpering in terror

 

[Grumpy]

 

[Grumpy]

Profiler Performance Products 174-X-C37-04 Pro-Filer Performance Products Big Block Chevy Sniper X Cylinder Heads | Summit Racing

Free Shipping - Pro-Filer Performance Products Big Block Chevy Sniper X Cylinder Heads with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

https://www.summitracing.com/parts/pfh-174-x-c37-04 $3020 EACH HEAD or $6040 a set of two

AIR FLOW RESEARCH OFFERS A PAIR OF SIMILAR HEADS
but be aware with upgrade parts like titanium valves , improved valve seats, rockers and stud girdles you could be looking at
over $11K -$14K for complete set of two heads

AFR 385cc Magnum BBC Competition Racing Heads - Free Shipping on Orders Over $109 at Summit Racing

Find AFR 385cc Magnum BBC Competition Racing Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 385cc Magnum BBC competition racing heads will feed your large displacement, high-rpm race engine the air it needs to deliver monster performance. The 385cc Magnum features AFR's...

www.summitracing.com

24° Magnum

Shop 24° Magnum Parts

www.airflowresearch.com

357cc BBC Rectangle Port Cylinder Head

Cylinder Head Specialists

www.airflowresearch.com

377cc BBC Rectangle Port Cylinder Head

Cylinder Head Specialists

www.airflowresearch.com

https://www.cjponyparts.com/edelbrock-victor-musi-big-block-chevy-cnc-cylinder-head-24-degree-complete-single/p/EDL61409/?year=1965&gclid=CjwKCAjwg4SpBhAKEiwAdyLwvEINcQVzDrUy4vS8Ri5YuN7RNYiIBMF-8Cigsgs1MvsNfznkV1zGChoCGgIQAvD_BwE

Edelbrock 61409 Edelbrock Musi/Victor 24 Degree CNC-Machined Cylinder Heads | Summit Racing

Free Shipping - Edelbrock Musi/Victor 24 Degree CNC-Machined Cylinder Heads with qualifying orders of $109. Shop Cylinder Heads at Summit Racing.

www.summitracing.com

Taking A Closer Look At Edelbrock’s New “Big Victor” 12-Degree Heads

Edelbrock and Pat Musi collaborated on the fully CNC-machined, new 12-degree Big Victor cylinder head for big-block Chevy engines.

www.dragzine.com

Big Victor 498cc CNC 12 Degree 2.500" x 1.800" Cylinder Head

Edelbrock's Big Victor cylinder heads are made with premium HIP aluminum alloy. They feature 498cc raised intake ports, 82cc chambers, and 2.500" / 1.800" Ex valve job.

www.edelbrock.com

AFR 385cc Magnum BBC Competition Racing Heads 2020-TI​

Cylinder Heads, Magnum Competition, Aluminum, Assembled, 121cc Chamber, 385cc Intake, Chevy, Pair
Part Number: AFR-2020-TI

$4,851.16

 

[Grumpy]

Budget Big-Block Cylinder Heads You Can Get Now

Buying big-block cylinder heads can get costly. To make sure you spend your cash wisely, here are a few budget-friendly options to guide you.

www.chevyhardcore.com

 

[Grumpy]

i FOUND THIS INFO POSTED AND THOUGHT SOME OF YOU MIGHT BENEFIT FROM POSTING THE INFO

https://www.edelbrock.com/victor-musi-big-block-chevy-cnc-cylinder-head-61409.html

Edelbrock/Musi Victor 24° CNC Ported Rectangle Port
2.35 intake valve the throat was at 88% of the valve
Good Port
.100 71 cfm
.200 150 cfm
.300 221 cfm
.400 282 cfm
.500 337 cfm
.600 390 cfm
.700 418 cfm
.800 420 cfm
.900 423 cfm
1.00 429 cfm

I thought the head would flow a bit more. so I went after the same port like a mad man :lol:

Good Port full ported with same 50* valve Job opened throat to 90%
.100 72 cfm
.200 154 cfm
.300 242 cfm
.400 310 cfm
.500 368 cfm
.600 425 cfm
.700 448 cfm
.800 462 cfm
.900 467 cfm
1.00 475 cfm