Cfm?

[monteboy84]

You're partially correct, cfm on a carburetor simply applies to the rated flow of the carburetor, it has nothing to do with how lean or rich the mixture is. Basically your need for flow in a carburetor is based on your entire motor system, and is directly related to the amount of air that the motor will flow, so for example a stock 350 V8 will require a smaller carburetor than an equivalent 350 that's been equipped with aftermarket high flowing heads, a high lift cam, a single plane intake, and headers, because the latter moves a lot more air. To adjust the mixture (rich/lean) you can change jetting to suit your particular motor, bigger jets to richen the mixture, or smaller jets to lean out the mixture.

This covers carburetor tech pretty well:
http://www.strokerkits.com/tech-info...cfm-rules.html



-matt