Quote:
Originally Posted by zzmac
I was just on the Holley website and their simple calculator recommends a 750cfm double pumper. For street driving and the occasional spirited driving do you think the 650cfm is more than enough for this engine (Roush 402R) or is the 750cfm a better choice? Thx!
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Depending on how hard you drive, a 650 is good for 5500 rpm for your 402 cubes.
A 750 is good for 6500. Both at 100%. Both figures would need to be lowered for volumetric efficiency. Typically 85-90% for a good street engine.
FYI, I run a Holley 850 DP annular on my 434.