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The Cometic MLS head gasket for Pontiac 400/428/455 V8 (4.200in bore, nominal .066in) features embossed stainless steel outer layers coated with Viton and AMP for robust sealing; compressed operating thickness is 0.066". The center uncoated stainless shim allows thickness adjustment while the multilayer construction rebounds under load, resists corrosion, reduces clamp load, and seals reliably across mixed-material head/block interfaces without additional sealants.
Cometic Pontiac 400/428/455 V8 .066in MLS Cylinder Head Gasket - 4.200in Bore
