Speedway Motors Press-In Rocker Arm Stud Pinning Kit with Roll Pins and Drill Bit for Stock Cylinder Heads, Prevents Stud Pull-Out on Pressed-In Applications

Add positive retention to your rocker arms with this complete stud pinning kit. Rocker stud pins are cheap insurance for race engines that require stock cylinder heads, or for mild street engines built on a budget. Most factory cylinder heads utlilize press-fit rocker arm studs, which can pull out under certain conditions. Stiffer valve springs, high-lift camshafts, high engine RPM, and engine overheating all contribute to stud failure. These roll pins lock each stud in place, preventing them from rotating or loosening. Works with all engines using pressed-in rocker arm studs. Note: Not for engines that use hollow studs, such as early Pontiac V8s, that have through-stud oiling for the rocker arms. Keeps press-in rocker arm studs from pulling out. Easy upgrade for stock heads. Cheap insurance when using stiffer springs or high lift cams. Effective upgrade that's been used by racers for decades. Can be installed without removing heads from engine. Includes (16) roll pins and (1) 5/32" drill bit.