CORRECTION: White board should read - (Peak torque RPM x 1 cy displacement) 88,200=PPA
Calculate the optimum header primary tube size for your power and performance needs. This video explains the importance of proper header primary diameter and includes key formulas for figuring out the right diameter for your engine. It also factors in primary tube length and how it affects your overall power and torque curves. http://www.summitracing.com/redirect?banner=SocialYT482