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The Cometic MLS head gasket for Chevrolet Mark‑IV/GM Gen‑V/VI Big Block V8 is a .040 in compressed thickness gasket for a 4.630 in bore and is intended for aftermarket heads with undersized water ports for customization. Cometic describes embossed stainless steel layers coated with Viton for heat resistance and rebound, plus an uncoated stainless center shim layer to handle varying thickness needs and harsh sealing environments.
Cometic Chevrolet Mark-IV/GM Gen-V/VI Big Block V8 .040in MLS Cylinder 4.630in Bore
