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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .070" compressed thickness) combines embossed stainless steel outer layers with Viton coating and a variable uncoated center shim for deck clearance tuning. Designed for high-output engines and aftermarket heads with undersized water ports, it seals without additional sealants, resists corrosion, rebounds under load and evens sealing load to help minimize bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .070in MLS Cylinder Head Gasket - 4.630in Bore
