ARP BB Chevy WP Merlin II and III Iron Block Main Bolt Kit

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Reference Information

Main Bolts, High Performance Series, Hex Head, Chromoly, Black Oxide, 4-Bolt Main, Chevy, Merlin II/III Iron Big Block, Kit

ARP High Performance Series main bolts are rated at 180,000 psi and a popular premium replacement for OEM fasteners. Designed to meet the exacting standards and demands of professional engine builders, ARP bolts are forged from 8740 chromoly steel and feature a reduced wrenching head, large underhead radius, and rolled threads for the utmost in reliability. The threads are rolled after heat-treating which gives them about 2,000 percent better fatigue strength than most main bolts that are threaded prior to heat-treating. Hardened parallel-ground washers are included with each kit.