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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.570" bore, .140" compressed thickness) features embossed stainless steel outer layers coated with heat-resistant Viton and an uncoated center shim for thickness tuning. Built to seal high-output engines without sealants, it suits aluminum-to-aluminum and aluminum-to-iron combinations, resists corrosion, rebounds under load and helps distribute clamp forces to reduce bore distortion during assembly.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .140in MLS Cylinder Head Gasket - 4.570in Bore
