ARP 247-4204 New Age 625 Head Studs | 98.5-23 5.9/6.7 CUMMINS New Age 625 12mm Head stud kit for the 98.5-2023 Dodge 5.9L & 6.7L 24 Valve, Common Rail Cummins Turbo Diesel With performance enthusiasts adding increasing amounts of turbo boost to diesel applications, ARP has provided an extra measure of security in the form of extra-strong head studs manufactured from the firm's proprietary Custom Age 625+ material that has a minimum rating of 260,000 psi tensile strength. They are engineered to provide the clamping force required to keep cylinder heads from lifting due to exceptionally high combustion pressures. ARP also offers head stud kits made from ARP2000 (220,000 psi minimum) for the Dodge/Cummins plus Chevy Duramax diesel, Ford 7.3L Powerstroke diesel, and 6.0L Powerstroke. The stud kits include heat-treated chrome-moly steel nuts (12-point) and parallel-ground washers. Install Instructions Click Here