Stage 8 Fasteners, Inc. 8913A HEADER BOLT KIT - 6PT. Locking Fastener Set eliminates the chance of blown gaskets and exhaust leaks Set of 16 3/8-16" Thread 1" Long for Small Block Ford Hex Head with Allen Key for easy installation in tight engine bays Header Fasteners, Bolts, Locking, Double Hex Head, Steel, Nickel Plated, Ford, 260, 289, 302, 351W, Set of 16