Pontiac 350 - 455 ARP High Performance Series Cylinder Head Bolt Kit # 190-3607Pontiac 350 455 ARP High Performance Series Cylinder Head Bolt Kit # 190 3607 Cylinder Head Bolts, High Performance, Hex Head, Pontiac, 350, 400, 428, 455, Kit Fastener Style: Bolt Undercut Stud: No Head Style: Hex Fastener Material: Chromoly Fastener Finish: Black oxide Washers Included: Yes Cut to Fit: No Quantity: Sold as a kit. ARP High Performance series head bolt kits are tough. They are rated at 180,000 psi 15 percent stronger than Grade 8