This ARP 154-3601 High Performance Cylinder Head Bolt Kit fits Small Block Ford 289-302 engines with either factory or Edelbrock 60259 / 60379 heads. These bolts come with a reduced wrenching hex head, eliminating the need for valve train removal to facilitate cylinder head retorquing. These High Performance Series bolts are rated at 180,000 psi (which is 15% stronger than Grade 8)! Kits come complete with hardened parallel ground washers. ARP 154-3601 High Performance Cylinder Head Bolt Kit Features: Fits Small Block Ford 289-302 engines with factory or Edelbrock 60259 / 60379 heads Head Style: Hex Material: Chromoly PSI Rating: 180,000 Color: Black Quantity: Sold as a kit ARP manufactures cylinder head fastener kits, connecting rod bolts, exhaust manifold/header fastener kits, oil pan fastener kits, and more.