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Old 05-09-2010, 10:16 PM
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66GMC 66GMC is offline
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CFM Calculator

383 ci 7500 RPM with 100% VE = 831 CFM
383 ci 7500 RPM with 92% VE = 764 CFM

That's what the figures say, but they do sound low to me.

I ran a 351C to 6000-6500 RPM and according to this the 600 CFM (1850 Holley) that I started out with should have done the job. Not so ... it seemed to run out of breath around 5500. I upgraded to a 750 CFM (3310 ) and that seemed to do the trick.

I'd suggest asking a buddy to borrow something a little bigger (850 CFM) and give that a trial pass.
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