If your intake is a dual plane like the street hemi are use the progressive, if it is not use it one to one, not progressive I've had both types on motors and the single plane dual quad intakes hook up progressive suck bad One to one is way better on them You don't starve the front cylinders near as bad with one to one


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