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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .075" compressed thickness) features embossed stainless steel layers with Viton-coated outer surfaces and a tunable uncoated shim. Intended for high-output and aftermarket configurations with undersized water ports, it seals reliably without sealants across different head/block material pairings, resists corrosion, rebounds under stress and reduces clamp-induced bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .075in MLS Cylinder Head Gasket - 4.630in Bore
