5912 Mr Gasket U/S EXH GSKT BB CHEV

U/S EXH GSKT BB CHEV exhaust gasket; big block Chevy; Mr. Gasket; Ultra-Seal; round port; BBC; Chevelle; Camaro; Nova; Corvette; Chevy II; GM; header gasket Mr. Gasket Ultra-Seal Header Gaskets Fits 1965-1990 Chevrolet 396-454 Mark IV Big Block. Round Ports, 2.15 Inch 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 original equipment replacement, high performance street, drag race and oval track use. Has A Graphite Core W/ Steel Outer Layers Graphite Core Has Excellent Thermo-conductivity Coated With High Temp Silicone For Sealing Will Not (brindle ) Or Indent Aluminum Heads