The FelPro 1027 Performance Cylinder Head Gasket is designed for Chevrolet Big Block engines with a 4.370" bore and a thickness of 0.039". Made of steel with a coated finish, this high-performance gasket features more than 10 bolt holes for secure installation in the engine compartment. Manufactured in the United States by FEL-PRO PERFORMANCE, this gasket is a universal fitment and is ideal for those seeking a reliable and durable sealing solution for their engine. Please note the California Prop 65 Warning for Cancer and Reproductive Harm.