7. We installed our cylinder heads using ARP head studs and Cometic MLS head gaskets. There are aftermarket rocker arms available for the late-model Hemi, but for our combination the factory rocker arms work just fine. We had to measure to attain proper pushrod length, and like the first and second generation Hemi engines the intake and exhaust pushrods are different lengths. Indy makes pushrods in-house, so we had our pushrods quickly for this project.