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The Cometic MLS head gasket for Chevrolet Mark‑IV GM Gen‑V/VI Big Block V8 (4.630" bore, .056" compressed thickness) uses embossed stainless steel layers with Viton-coated outer faces and an adjustable uncoated shim layer. Built to seal high-output engines without sealants, it supports aluminum-to-aluminum and aluminum-to-iron head/block combinations and accepts undersized water ports for aftermarket heads. The multilayer design rebounds under stress, resists corrosion and minimizes bore distortion.
Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .056in MLS Cylinder Head Gasket - 4.630in Bore
