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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .030" compressed thickness) uses multiple embossed stainless steel layers with Viton-coated outer faces to provide reliable sealing without sealants. Suited to aftermarket heads with undersized water ports, its uncoated center shim allows thickness variation. The multilayer design rebounds under load, resists corrosion and evens load distribution to minimize bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .030in MLS Cylinder Head Gasket - 4.630in Bore
