MINIMAL CROSS SECTIONAL AREA CYLINDER HEAD FORMULA

  1. This formula is for estimating the smallest acceptable port size to achieve the desired RPM goal.
  2. The cross-sectional area is measured at the tightest restriction within the intake port, often referred to as the "pinch"
  3. Min CSA = (bore x bore x stroke x RPM x .00353) / 613.8
* denotes required field