The studs are manufactured from 8740 chrome moly steel, heat-treated at ARP to 190,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 2000% stronger than others.
8740: This ARP head stud kit uses premium grade 8740 chrome molly. Each stud is placed vertically into special racks and precisely heat-treated to 190,000 psi. This procedure ensures complete heat penetration and the results are far superior.
Note this kit is designed for 1G-FE VVTi but should also work for all variants of 1G with minor modification.
