Mr P ran his header program for me for my 526 C.I. motor, it called for 2.201 diameter on the frist step primary pipe, 15 inches long and 2.326 diameter on the second step 15 inches long into a 4.0 inch collector 16.0 long Where going to use a 2 1/8 first step with a 2.250 second step with the 4.0 inch collectors IHTHs


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)