ARP2000 head stud upgrade, replacing the factory head bolts. Fits the 2007.5-2018 Ram 2500/3500 pickup and 3500/4500/5500 cab and chassis 6.7L Cummins. Add-on for our remanufactured 6.7L long block; installed on the engine before shipping only (not sold loose, since fitting studs means pulling the head).