ARP Head Bolts

All Pro Series Head Bolts are cold-forged to ensure molecular integrity, heat-treated prior to thread rolling and machining, and are rated nominally at 190,000 psi. ARP® Pro Series head bolt kits are application specific—designed for use with typically competition only components. These fasteners deliver superior strength and meet the ARP® “ZERO defect—ZERO failure” quality standard. Hardened and parallel-ground washers are included with each kit to ensure even load distribution and accurate torque readings. All Pro Series head bolts have a reduced wrenching 12-point head and wide area flange to eliminate the need for valve train removal for cylinder head retorquing and permits the use of larger diameter valve springs.