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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .092" compressed thickness) combines embossed stainless steel outer layers coated in heat-resistant Viton with a tunable uncoated center shim. Engineered to seal high-output engines without sealants and to accept undersized water ports for aftermarket heads, it works across aluminum and cast-iron interfaces, resists corrosion, rebounds under load and evens clamp loads to limit bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .092in MLS Cylinder Head Gasket - 4.630in Bore
