Case head bolt bosses must be machined to 7/16x14 and cylinder head bolt holes reamed out.
TPR offers a head bolt hole reamer, part # TPR170
Studs have a coarse thread on case side for maximum thread engagement and fine thread on nut side for superior torque achievement. These studs have been proven in applications running in excess of 60lbs of boost. We recommend torquing to 85ft lbs with ARP moly lube. It is very important that there is no lube applied between the washer and cylinder head, it must be dry and free of oils. Only apply lube to threads on nut end of stud and face of the nut.
