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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .140" compressed thickness) features embossed stainless steel outer layers with Viton coating and a variable uncoated shim to suit different deck clearances. Designed for high-output engines and aftermarket heads with undersized water ports, it seals without sealants between aluminum or iron components, resists corrosion, rebounds under stress and helps distribute clamp load to reduce bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .140in MLS Cylinder Head Gasket - 4.630in Bore
