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Cometic multi‑layer steel (MLS) head gasket for Chevrolet Mark‑IV/GM big block V8, 4.630 in. bore and .040 in. compressed thickness, is built for modern high‑output engines. Embossed stainless steel outer layers are coated with Viton for heat resistance and corrosion protection, while the uncoated center shim layer allows thickness variation. MLS construction provides improved sealing across differing head/block material combinations without sealants.
Cometic GM Gen II/ Mark IV BB 4.630in Bore .040in MLS (396 / 402 / 427 / 454) Head Gasket
