The threads are rolled after heat-treating which gives them about 2000% better fatigue strength than most main bolts that are threaded prior to heat-treating. Hardened parallel-ground-washers are included with each kit.
The ARP 154-5004 Ford Cleveland, High Performance 2-Bolt Main Bolts, Hex Head, Kit would be a great fit for professionals who need high-quality bolts for their Ford applications.
