Description Main Stud kit for 4.6L 2 valve 2 bolt main There are many important reasons to use ARP® main stud kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 190,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others. ARP® stud kits are available with your choice of conventional hex nuts or compact 12-point nuts
