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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .065" compressed thickness) features embossed stainless steel outer layers coated with Viton and a variable uncoated center shim. Intended for high-output engines and aftermarket heads with undersized water ports, it seals reliably without sealants across aluminum and cast-iron interfaces. The multilayer construction improves rebound, resists corrosion and evens load to limit bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .065in MLS Cylinder Head Gasket - 4.630in Bore
