Originally Posted by Cab_Burge
The ductile iron adjustable rocker arms are wider so the hold downs need to be narrower, Mopar added small bosses, ears, on both sides at the top for the stamp steel rocker stands, they can be used by removing, them wrench no big deal scope up

I’ll be using the iron rockers, I can see what you’re saying about that edge part. If I could run across a set of 67 heads (915) with small exhaust I won’t need to do the 516 heads. I want to keep the closed chamber.