Mr. Gasket 5913 - Header Gaskets - Ultra-Seal - 396-454 Chevrolet Big Block Mark IV 1965-90

Port Size 2.09" x 2.09" Port Shape Square Collector Gaskets Included No ? Manufactured from high-temperature steel core/graphite faced exhaust material. ? Expanded steel core provides stability and maximum torque retention to eliminate gasket failure. ? Graphite facing provides excellent heat resistance and thermal conductivity to transfer heat away from the cylinder head. ? Conforms to and seals minor surface irregularities. High recovery material allows header or manifold flange to stay sealed if flange loses clamp-load. ? Can be trimmed if necessary for modified port applications. ? For OE replacement, high performance street, drag race and oval track use.