ARP 247-5404 4BT Cummins 3.9L 4-Cyl Main Stud Kit

Here’s just what you need to secure a bellhousing in place. The studs in the ARP 247-5404 Main Stud Kit are designed with a radiused head to position the bellhousing and accept nuts without the fear of cross-threading. There are many important reasons to use ARP main stud kits, including the elimination of main cap walk and fretting, as well as the protection of the threads in your engine block. All kits come complete with hardened parallel-ground washers and high-quality nuts. Some 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 studs are manufactured from 8740 chromoly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat treatment to create a fastener that has threads 2000% stronger than others.