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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .086" compressed thickness) uses embossed stainless steel outer layers coated with Viton and a variable uncoated center shim for thickness control. Built for high-output engines and aftermarket heads with undersized water ports, it seals without sealants, withstands dissimilar head/block materials, resists corrosion and evens clamp load to help limit bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .086in MLS Cylinder Head Gasket - 4.630in Bore
