flow rates of BBC heads
Thread Starter
Supreme Member
Joined: Jul 2000
Posts: 4,541
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
flow rates of BBC heads
what are the typical flow rates of typical passenger car/truck BBC chevy heads?
like non LS6/extra hi-performance variants
thanx
like non LS6/extra hi-performance variants
thanx
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
They vary widely. There's everything from late-model peanut-port heads to the forged nonobtanium/irreplacium alloy LS6 and ZL1 parts.
Post a casting #, maybe someone can help. Or, a specific application you intend to build for.
There's alot more variation in BBC heads than just flow rates. Many different chamber volumes, open/closed chambers, etc.
Post a casting #, maybe someone can help. Or, a specific application you intend to build for.
There's alot more variation in BBC heads than just flow rates. Many different chamber volumes, open/closed chambers, etc.
Thread Starter
Supreme Member
Joined: Jul 2000
Posts: 4,541
Likes: 2
Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
oh of course
i'm just looking to get a ballpark range
like maybe the worst heads (the peanut port ones you mentioned)
a mediocre set
and the best factory iron casting?
doesnt have to be exact, just a ballpark range so i can make a mental decision
thanx
i'm just looking to get a ballpark range
like maybe the worst heads (the peanut port ones you mentioned)
a mediocre set
and the best factory iron casting?
doesnt have to be exact, just a ballpark range so i can make a mental decision
thanx
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
They go anywhere from about 175 CFM on the intake for the late-model truck stuff, up to about 325 for the square-port ones.
The best iron ones will do about 275 CFM, like the 781 from some mid-70s 454s.
These numbers can of course be improved with porting.
Again, huge variation among them. Much more variation than stock small block heads. And alot more to think about when choosing a set than just the raw flow numbers in stock form.
The best iron ones will do about 275 CFM, like the 781 from some mid-70s 454s.
These numbers can of course be improved with porting.
Again, huge variation among them. Much more variation than stock small block heads. And alot more to think about when choosing a set than just the raw flow numbers in stock form.
Supreme Member
Joined: Sep 2001
Posts: 6,111
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From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Search the technical articles online at www.hotrod.com
and or www.popularhotrodding.com
There is a article there with an extensive data base on
the flow rates of verious stock and high performance small block and bigblock chevy cylinder heads.
and or www.popularhotrodding.com
There is a article there with an extensive data base on
the flow rates of verious stock and high performance small block and bigblock chevy cylinder heads.
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