These kits fit most V-8 and many other engines. Includes 16 bolts and locking hardware. 100% reliable, zero failures in more than 6,000,000 applications. Header fasteners absolutely, positively will not back out. Eliminates the need to monitor and tighten bolts regularly. Grade 8 aircraft quality bolts with a duplex nickel plating that are made in U.S.A. Manufacturer's Lifetime Warranty.