5.9 Cummins Flexplate Bolt Upgrade kit for High RPM Applications

Extended-Length ARP Flexplate Bolt Kit This kit includes extended-length ARP flexplate-to-crankshaft bolts, Nord-Lock washers, and a bottoming tap for proper installation. MPT recommends this kit for all Manual Valve Body applications, especially in setups that are expected to exceed 4,000 RPM. No crankshaft drilling is required. The included bottoming tap is used to extend the existing crankshaft threads approximately 1/4", or about four additional threads, allowing the longer ARP bolts to seat properly and achieve maximum thread engagement. The bottoming tap is specifically intended to maximize the usable thread depth in the crankshaft. For best results, tap slowly and carefully. Frequently remove the tap to clear debris, and use compressed air to blow chips out of the holes before final bolt installation. This helps ensure clean, accurate threads and proper fastener seating.