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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .045" compressed thickness) employs embossed stainless steel outer layers coated with Viton and a tunable uncoated center shim. Designed to seal modern high-output engines without sealants, it works well with aluminum or cast-iron blocks and aftermarket heads with undersized water ports. The multilayer build resists corrosion, evens load distribution and reduces required clamp load.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .045in MLS Cylinder Head Gasket - 4.630in Bore
