ARP Main Stud Kit - Toyota 22R

All the ARP Main Stud Kits come complete with hardened parallel-ground washers and premium quality nuts. Some engine applications have provisions for mounting windage trays and have specially designed standoff studs with serrated lock nuts to position the windage tray and lock it securely in place. The ARP Main Stud Kits are manufactured from 8740 chrome-moly steel, heat treated in house to 200,000 psi tensile strength, and precision J-form threads rolled after the heat treating process to create a fastener that has threads 1,000% stronger than the other competitors.

Studs VS Bolts

ARP recommends the use of main studs over bolts whenever possible for several key reasons. First, using the ARP Main Stud Kit gives the user the ability to obtain more accurate torque readings because clamping forces are on one axis. By the same token, there is less force exerted on the Toyota 22R’s block threads, which contributes to improved block life (very critical on aluminum blocks). Finally, there are factors of easier engine assembly and proper alignment of caps every time.