Description
All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to threadrolling and machining, and meet the ARP “ZERO defect – ZERO failure” quality standard. ARPPro Series head bolt kits are application specific and designed to deliver superior strengthtypically associated with competition engines. Pro Series kits are available in standard(8740) 190,000 psi tensile strength material and proprietary (ARP2000®) 220,000 psi tensilestrength material where noted. All Pro Series head bolts have a reduced wrenching hex or12-point head and wide area flange to permit the use of larger diameter valve springs andeliminate the need for valve train removal during cylinder head retorquing. Hardened parallel-ground washers are included in each kit. Most applications have undercut short bolts thatcan help eliminate head gasket failures through providing more “stretch” to compensate forthe additional compression of gaskets.
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