This calculator estimates the "Area Under Curve" (AUC) for the cylinder head flow data entered. Since the calculator uses the trapezoidal-rule numerical integration method, the result is an approximation of the average CFM value.
NOTE: If your cam lift is less than the lift of the flow data, enter only the flow up to the cam lift, i.e., if the cam lift is .500", input head flows to .500" lift.