so did all of the above and decided to recheck the rockers before I started.. found number 8 bent... ran to napa , replaced it. The others look ok but I think the issue is the rebuild mechanic used roller rockers, that are non-self aligning... and I don't see guides on the head anywhere and several of the rockers move on the roller part way over. I dd notice on the two rods I pulled have a shiny spot where they are rubbing on the head. They sure don't stay centered. By the way these are vortec heads...