ARP 134-3610 Head Bolt Kit for 2004-Later GM Gen IV LS 4.8L 5.3L 6.0L 6.2L EnginesOPEN BOX ITEM Applications Chevrolet Small Block Gen III, IV LS Series small block (2004 & later except LS9) w all same length hex bolts These Pro series cylinder head bolts 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 190,000 psi. All kits come complete with hardened parallel washers for even load distribution and accurate torque readings.