ARP Head Stud Kits | Multiple Pontiac Fitments (190-4002)Head Stud Kit by ARP The 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. The Pro Series are also available with hex and 12 point heads. All kits come complete with hardened parallel washers for even load distribution and accurate torque readings. Features Fastener Style: Stud Undercut Stud: No Head Style: Hex