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Cometic MLS head gaskets for Chevrolet Big Block Mark IV V8 (4.320" bore, .040" compressed thickness) use multiple embossed stainless steel layers with Viton-coated outer layers for heat resistance and sealing without sealants. The multi-layer steel construction allows rebound, corrosion resistance, and even load distribution while accommodating aluminum-to-aluminum or aluminum-to-iron head/block combinations common in high-output engines.
Cometic Chevy BB Gen IV 396/402/427/454 H/G 4.320 inch Bore .040 inch MLS Head Gasket
