ARP 554-9803 Black Oxide Steel Hex Engine & Fastener Kit | Autoplicity Please note that these kits are designed for carbureted engines, so newer EFI applications, or those with aftermarket components, may require the purchase of additional fasteners. Contains 12 groups of fasteners, virtually everything you need to assemble a show-quality carbureted engine More importantly, each and every fastener is superior in strength to the OEM bolts, and also significantly better than hardware grades, even Grade 8., Traditionalists will appreciate the strength and functionality of ARP's heat-treated 8740 Chrome Moly steel alloy bolts, which feature a black oxide finish. Black Oxide Hex Bolt Kit ARP 545-9601 ARP Engine Bolt Kits | Summit Racing Hex Engine Bolts Engine and Accessory Fastener Kit, Hex Head, Chromoly, Black Oxide, Small Block Ford, Kit. See full description Manufactured from heat-treated 8740 chrome moly steel with a black oxide finish It's easy to assemble a show-quality engine when you use ARP's handy Engine And Accessory Fastener Kit. ARP, Engine & Accessory Fastener Kit, Chev BB, 12-Point Head, Stainless Heads are traditional hex style, and premium-quality washers are included