Pro series cylinder head studs from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining and are rated at a whopping 220,000 psi. ARP Pro series kits are also available with 12-point nuts, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings.

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ARP Main Bolts, Pro Series, 4-Bolt Main, For Chevrolet, 350, with 1/2 in. Straps, Kit

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