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The Cometic MLS head gasket for Pontiac 400/428/455 V8 (4.200in bore, nominal .040in) is built from embossed stainless steel layers with Viton-coated outer faces and AMP for durable sealing; compressed operating thickness is 0.040". The uncoated shim center allows thickness adjustment, helping the gasket conform clamp load, resist corrosion, and provide consistent sealing between aluminum heads and cast iron or aluminum blocks without sealants.
Cometic Pontiac 400/428/455 V8 .040in MLS Cylinder Head Gasket - 4.200in Bore
