There are many important reasons to use ARP main stud kits, including the elimination of fretting and main cap walk, as well as protecting the threads in your engine block.
All kits come complete with high quality nuts and hardened parallel-ground washers.
Some applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to securely position the windage tray.
The studs are manufactured from 8740 chrome moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000 stronger than others.
ARP main bolts are far superior to any other main bolt kit offered for use in competition engines, designed to meet the exacting standards and demands 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 makes 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, is a premium replacement for OEM fasteners, 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.
