Thanks for the quick reply. The rocker I broke was the older design promagnum. Before I had these on the engine I had a set of Unknown brand aluminun rockers on the engine for 2 years. They were ok but seemed to be getting a little loose. I checked for coil bind back when I put the engine together. Can't remember seat pressure right off. It is what Comp cams recommended when they ground the cam. Cam is a custom grind billit. Shift point is 7000 Valves are +.100 manley sever dutys. The heads are heavily ported and flow benched 781s