Calculating cubic inches and volumetric efficiency to arrive at the correct carburetor CFM size for any given engine combination seems like a reasonable way to go about things. Sure, the formulas work well when you’re dealing with a completely stock engine, but when you start trying to make real power, it will leave you wanting a whole lot more.
Uncle Tony offers up a rundown of some of the factors at play, how the manufacturers chose carburetor packages, and a few basic guidelines that will get you headed in the right direction…
