Quote:

Very little to none if you use the Chevy pin size.

Rod pin size on the crankshaft and wrist pin size, use either H beam steel rods or I beam steel rods, aluminum rods are a different story You will probally have to grind a small amount off of the oil pump pick up boss with BB Chevy steel rods and a 4.25 stroke. if you use the 4.15 stroke with Mopar rod size and steel rods then you have a lot more grinding to do on every cylinder wall as well as on the oil pump pickup boss

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