This ARP 400-1102 BBC/Ford High Performance Header Bolt Kit comes with 180,000 PSI Stainless Steel hex head bolts. This is up to 5X stronger than stock! They have a 3/8-16" thread and a 0.750" Under Head Length. Kits come complete with washers. Sold as a set of 16. ARP 400-1102 BBC/Ford Header Bolt Kit Fits: Big Block Chevrolet Engines Ford Engines ARP manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 12-point nuts. The ARP Stainless material is not affected by corrosion or extreme heat, making it ideal for the application. What’s more, the compact 12-point nut lets you easily slip a socket close to the pipe. ARP manufactures their studs with a unique nut-starter nose that helps prevent cross-threading. Studs and bolts come either black oxide chrome moly or polished ARP Stainless, both nominally rated at 180,000 psi tensile strength, substantially stronger than Grade 8 hardware. Specially drilled “NASCAR” models are available for those who wish to safety wire their header bolts to prevent loosening.
