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The Cometic copper exhaust manifold gasket for Chevrolet Mark-IV and GM Gen-V/VI big block V8s (0.043in) is rated for extreme exhaust environments, resisting temperatures up to 2000 F and compressing to seal imperfect flange surfaces. Corrosion resistant and requiring no sealants, the copper design resists burn-through, maintains torque set and supports reliable manifold-to-head sealing under high cylinder pressures.
Cometic Chevrolet Mark-IV GM Gen-V/VI Big Block V8 .043in Copper Exhaust Manifold Gasket
