There are many important reasons to use main stud kits from ARP, including the elimination of fretting and main cap walk, as well as protecting the threads in your engine block.
Complete with hardened parallel-ground washers and high-quality nuts, all kits feature provisions for mounting windage trays in some applications and specially designed standoff studs with serrated lock nuts to securely position the windage tray.
Manufactured from 8740 chrome moly steel, the studs are heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads are rolled after heat-treat to create a fastener with threads 1000 stronger than others.
Far superior to any other main bolt kit offered for use in competition engines, ARP main bolts are designed to meet the exacting demands and standards of professional engine builders.
Forged from 8740 chrome moly, all bolts feature rolled threads and generous under-head radius for utmost reliability.
The threads are rolled after heat-treating, which gives them about 1000 longer fatigue life than most main bolts, which are threaded prior to heat-treating.
Available in the popular High Performance Series, which has a nominal rating of 180,000 psi, or the 200,000 psi nominal rated Pro Series, application-specific main bolts with reduced wrenching head designed for use in competition applications.
Each kit includes parallel-ground, hardened washers.
