How do I select the correct CFM carburetor for my application?
Answer: The
carburetor CFM is a very critical choice in your build. Too large will cause low RPM issues and a rich condition. Too small will restrict the engine performance at high RPM. A simple formula is commonly used by our techs to select the proper CFM:
(Cubic inch of engine X Max RPM) / 3456 = maximum CFM required
Ex. (350ci X 6500RPM)/3456=658.28 CFM (a 650 CFM would be ideal for this application)
which is interesting - because that would lead me to a 650 - but my engine guy and the dyno people both suggested 750...