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High Performance Series Hex Head Bolt Kit (155-3604) by ARP®. Package Type: Box. High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head retorquing. All High Performance Series bolts are 180,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers. All Pro Series bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and meet the ARP “ZERO defect – ZERO failure” quality standard. ARP Pro Series head bolt kits are application specific and designed to deliver superior strength typically associated with competition engines.
Fits Following Models:With Ford Big Block FE 6.4L
Specifications:
- Fastener Style: Bolt
- PackageType: Box
- Finish: Black
- Material: 8740 Chrome Moly
- Head Type: Hex
Features:
- Designed to unlock more performance out of your vehicle
- Deliver a reasonable balance of strength and durability
- Premium construction built with unmatched quality standards
- Ensure smooth, reliable operation and long-lasting service
Pro Series kits are available in standard (8740) 190,000 psi tensile strength material and proprietary (ARP2000®) 220,000 psi tensile strength material where noted. All Pro Series head bolts have a reduced wrenching hex or 12-point head and wide area flange to permit the use of larger diameter valve springs and eliminate 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 that can help eliminate head gasket failures through providing more “stretch” to compensate for the additional compression of gaskets.
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