This copper header gasket set is designed for Ford Small Block SBF engines using rectangular exhaust ports, including 289, 302, and 351W applications. Built from solid copper, these gaskets are intended to provide reliable sealing under high exhaust temperatures without relying on composite layers or sealant coatings. Copper gaskets are commonly used in performance and restoration builds due to their ability to conform during installation and withstand repeated heat cycles. When installed on clean, flat flanges with proper torque, they can be reused during future service or header changes. This set includes two gaskets to cover both sides of the engine. The port layout matches standard small block Ford rectangular exhaust port spacing. These gaskets are compatible with most aftermarket headers and factory style exhaust manifolds designed for the same port shape. Installation notes: Surface preparation is critical. Header flanges and cylinder head surfaces should be clean and flat. Follow recommended torque specifications and recheck fasteners after initial heat cycles. This gasket set is intended as a direct replacement style solution for small block Ford exhaust sealing needs without exaggerated performance claims or unnecessary additives.