BBC 049 Flow Numbers vs. Piston and Cam Size - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-19-2010, 05:49 PM
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BBC 049 Flow Numbers vs. Piston and Cam Size

Ok Fellows, I have two sets of 049 heads that have seen different levels of modification and I am trying to decide which ones to use for a 67 Camaro convertible. I guess I am wanting my cake and eat it too, because I want it to run well but also be dependable.

The first set was modified by Mark Stahl racing products and the port/polish is beautifully done. The flow numbers are 300 CFM @ approximately .625 lift and 230CFM on the exhaust. They have 2.19 and 1.88 valves.

The second set has only been reworked and 2.19/1.88's valves installed with no port work.

I suppose my question is, will the full port heads be too much for a street car? I don't plan on running a .625 cam so would a smaller cam, say a .510 or .544 be compatible or would it lean out?

Feel free to offer your opinions on a good combination using either of the two sets. I really want to get it right the first time without being dissapointed.

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Old 08-19-2010, 07:52 PM
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Use the ported set, you will be much happier with the outcome.

Your full port head flow #'s are not all that radical, you can now buy off the shelf aluminum Small Block heads that will pull those #'s. Radical for BBC would be 375+ intake side, 250+ exhaust side.

No worries about lean out, heads have nothing to do with carburetor jetting and adjustments.

You didn't tell us how big the engine will be, they would be fairly big on a 396, just slightly above average on a 454.
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Old 08-19-2010, 08:33 PM
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Thanks for the info. They will be on a 454. I suppose I can call COMP and get a cam dialed with the the flow numbers and CR.
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