The CFM Sizing Rule
The most common mistake when building a performance inline six is selecting a carburetor that's simply too large. Bigger is not better when it comes to carburetors — an oversized carb kills throttle response, produces a flat or stumbling idle, and actually reduces power in normal driving conditions because fuel velocity through the venturis drops too low to atomize properly.
The basic formula for estimating carb size is:
Code:
CFM =...
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