Head Bolt Set, 12-Point Head S480 Turbo Engineered with dual ceramic ball

Engineered with dual ceramic ball bearings and precision-machined internals

4L L4 (4G64) 10/09-On

SHAUN'S CUSTOM ALLOY CNC Machined Billet Valve Covers are more than just a cosmetic upgrade

9 wide-band control

Head Bolt Set, 12-Point Head S480 Turbo Engineered with dual ceramic ballfits GM LSA Part Number : AR134 3713 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. Pro Series kits are available in standard (8740) 190,000 psi tensile strength material and