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.

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ARP Bolts, 12-Point Head, Chromoly Steel, Black Oxide, 3/8 in.-16 RH Thread, 1.000 in. UHL, Set of 5

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ARP Nut, Hex, ARP Stainless Steel, Polished, Flanged, 3/8 in.-24 Thread, 180000psi, Each

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ARP Bolts, Hex Head, Custom 450, Black Oxide, 3/8 in.-16 RH Thread, 2.500 in. UHL, Set of 5

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ARP Washer, Hardened, High Performance, Chamfer, Flat, 5/16 in. ID, 0.625 in. OD, 0.120 Thick, Stainless Steel, Polished, Set of 2

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