Our Comp Cams valvetrain employs a rocker-arm stud girdle to maintain stability. Marvin adjusts the hydraulic roller-tappet valvetrain at .005-.010 inch to prevent valve float. These are 1.7:1 ratio Comp Cams roller rockers with needle-bearing fulcrums. Check the fulcrum snap rings for proper seating, and make sure they're facing the correct way. Sharp edges must face out. If they come out of the box with the sharp edges facing in, turn them around, lock them in, and check for proper seating.