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The Cometic MLS head gasket for GM/Mercury Marine Gen-IV big block V8 engines is specified for a 4.500 inch bore with a compressed thickness of 0.051 inch and includes two slotted lifter valley bolts. Multi-layer steel construction uses embossed outer layers and uncoated center shim for strength, Viton-coated surfaces, and the ability to seal aluminum-to-aluminum or aluminum-to-iron mating surfaces without sealants.
Cometic Mercury / Chevy Big Block 4.5in Bore .051 inch MLS Head Gasket
