If my engine is a stock Chevy 250 with a dual tube headers exhaust, with probably a 85% of volumetric efficiency, according to the equation "CFM = ((peak rpm * cid)/3456)*.85", it will have to rev 9758 rpm reach 600cfm. But my engine revs only about 5500-6000 rpm.
So, I'll never de able to run a stock Chevy 250 with a Clifford intake for a 4-barrel Holley 600 cfm??? I'm not happy now...
I was planning to do a nice work in my heads before install the carb&intake setup, but now I'm confused... The camshaft will affect directly the Volumetric Effiency or not?
What modifications will I have to do to run this setup?
Does someone ever reached 600+ cfm on a 250, especially reving only about 5500-6000 rpm?
|o| Help!
