They make a head stud kit for them as well as head bolts. I bought the stud kit. I mocked up a set of Harland Sharp rocker arms that came off my Stage 6 heads and the roller was not even close to where it needs to be, even with lash caps, so I also bought the correct ones. Which ever version you buy plan on taking them apart and checking spring pressures, installed heights and especially coil bind. Piston valve reliefs will need to be checked to make sure you have clearance. Birdtracker