[Steve C.]

Another important comment from Paul....

"Your 200 CFM number is most likely coming from total flow through the induction system"

And related. Air Flow Research developed a formula based on air flow. It predicts a normally aspirated engine's horsepower potential based on intake-system airflow.
It is based on the net cfm airflow delivered at the valve thru the carb, intake manifold and cylinder head. Not the cylinder head cfm flow itself. The formula.....

Horsepower = 0.25714 x cfm at 28" x number of cylinders

There are some caveats involved. Actually reaching the predicted power level requires the engine to have the right compression, the right cam, a tuned exhaust, and a nonrestrictive carb and intake manifold.
The combined lift generated by the cam lobe and rocker arm should equal the observed lift on the flow bench needed to achieve the desired intake port flow, plus a good exhaust port flow. Etc, etc.

( Information provided in this post does not represent any endorsement of the formula stated and is offered for general interest only )



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