The ARP 4age head stud kit is designed for the 16v 4age. The ARP head studs help eliminate the weak link in any 4age build and are a must when replacing the head gasket. The studs are made from 8740 Chromoly steel and heat-treated in-house to 200,000 psi tensile-strength rating. The kit comes complete with high-quality nuts, washers, and assembly lube. This is a must for 4age builds!