I HAVE 454BB WITH A 280 HYD. CAM IN IT. I ALSO HAVE HEADERS, MSD INGNITION SYSTEM AND AIR GAP INTAKE MANIFOLD. I WAS WONDERING IF IT COULD TAKE A 1000 CFM HOLLEY DOMINATOR.
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I HAVE 454BB WITH A 280 HYD. CAM IN IT. I ALSO HAVE HEADERS, MSD INGNITION SYSTEM AND AIR GAP INTAKE MANIFOLD. I WAS WONDERING IF IT COULD TAKE A 1000 CFM HOLLEY DOMINATOR.
Blazer,
One method is to use a formula to determine the CFM requirements for your engine. It's based upon the engine's cubic inches and the maximum RPMs that you expect to turn. You also need the VOLUMETRIC EFFICIENCY PERCENTAGE (VE%) of the engine. If an engine could use all of the air it ingested, it would have a VE% of 100%. Some performance engines reach this level. Most production engines and most street performance engines have VE levels below 100%. Stock, production, low performance engines will fall around 75%-85% volumetric efficiency.
The formula is: CARB CFM = Cubic Inches x RPM's / 3,456 x VE%
So, if you can turn 6,000 RPM and your engine has a VE of 95%...
454 x 6,000 / 3,456 x 95% = 749 CFM
You should probably run a 750 or 850 CFM carburetor.
Dan J
Just based on your cam I'd say you're more of a candidate for a 750 maybe 850. What size headers, which heads, and what are you trying to do with the engine?(i.e. street driving, towing,???)