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Return to Parts List Category : F- 426 Hemi (Gen 2) ARP 245-1301 EXHAUST STUD KIT - 12PT. 8- 5/16" X 1.5 AND 8 5/16" X 1.75" W/ 12 PT HEX NUTS BLACK OXIDE $103.99 ARP Brand, Black Oxide, 170,000 Psi Tensile Strength Fits all small blocks. 8 Studs are 1.670" overall and 8 of them are 2.00" overall. Be sure they are long enough for your application. External 12-Point, Steel, Black Oxide, Mopar, Small Block/Polysphere, Set of 16 Header Fasteners, Studs ARP manufactures a variety of header stud kits to facilitate the installation of your headers. Rated at 170,000 psi, they're much stronger than stock and will last under even the most severe conditions. Each kit includes the specific number of parts required for the desired application, plus premium-quality washers and either hex or 12-point nuts. Universal kits are also available.