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The Cometic MLS head gasket for Chevrolet Big Block aftermarket heads is a .040" multi-layer steel gasket with embossed outer layers coated in Viton for high-temperature sealing. Designed for GM Mark‑IV and Gen‑V/VI big block V8s with a 4.570" bore, it withstands aluminum-to-aluminum and aluminum-to-cast-iron mating surfaces without sealants. Outer layers and a variable shim center layer improve load distribution and reduce bore distortion.
Cometic Chevy Big Block Brodix Big Duke/Big Brodie Heads 4.57in Bore .040in MLS Head Gasket
