bits of head flow related info on some aftermarket heads

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
yeah this top video is a SBC and the remaining 4 below are BBC




you should watch all the way through all five videos
there seems to be a wide variation in the quality of the machine work being done
in many cases and the heads obviously vary in quality of machine work from various sources
this has always been the case, a good skilled machine shop makes a huge difference in the quality and durability,
of the cylinder heads you receive and how durable and dependable they will be in use!

any idiot can slap parts together on a cylinder head,
but it takes an experienced machinist to do a decent multi angles valve job and check clearances on the heads.
and as always you tend to get what you pay for and higher quality heads and components do tend to cost more.:facepalm::like:






 
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watch this video
as a basic guide your ideal street/strip
performance small block chevy head

should flow at least 250 cfm at .500 lift and ideally 280 cfm plus at .700 lift

www.profilerperformance.com

210cc All American Aluminum 23° SBC Racing Heads, Assembled, Straight

Producer and Seller of aluminum aftermarket cylinder heads, intake manifolds and engine accessories. Specializing in big block chevy ,small block chevy, big block ford and small block ford.
www.profilerperformance.com
www.profilerperformance.com

as a basic guide your ideal street/strip performance BIG block chevy head
should flow at least 350 cfm at .500 lift and ideally 380 cfm plus at .700 lift


example

AFR 357cc BBC Rectangle Port Cylinder Heads 100% CNC Ported No Parts - Air Flow Research 3570 - TREperformance.com

TREperformance sells new AFR 357cc BBC Rectangle Port Magnum aluminum cylinder heads from Air Flow Research for almost any Chevy big block vehicle, this is part # 3570.
treperformance.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/

obviously you have options

www.summitracing.com

Free Shipping on Orders Over $109 at Summit Racing

Find Parts and Accessories dart shp heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing!
www.summitracing.com
www.summitracing.com
a set of those dart heads is almost $1780

youll spend a bit more (about $400 more)on profiler heads but they would easily boost power at least 20-30 hp
www.profilerperformance.com

210cc All American Aluminum 23° SBC Racing Heads, Assembled, Angle Plu

Producer and Seller of aluminum aftermarket cylinder heads, intake manifolds and engine accessories. Specializing in big block chevy ,small block chevy, big block ford and small block ford.
www.profilerperformance.com
www.profilerperformance.com
www.airflowresearch.com

195cc SBC Race Cylinder Head

Air Flow Research's 195cc SBC Race Cylinder Heads are the preferred choice for a more aggressive street or street/strip build. 195cc SBC Race Cylinder Heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for...
www.airflowresearch.com
www.airflowresearch.com
as a general rule, on a SBC performance engine build ,
try to select a cylinder head that reaches or exceeds 250 cfm at .500 lift and ideally 280 cfm PLUS at max lift PLUS

or you could get similar performance to the dart heads for several hundred dollars less
www.airflowresearch.com

195cc SBC Enforcer Cylinder Head

Air Flow Research's 195cc SBC Enforcer Cylinder Heads feature AFR's 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 cylinder head is...
www.airflowresearch.com
www.airflowresearch.com
 
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