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The Cometic MLS cylinder head gasket for Chevrolet 348/409 W-Series Big Block V8 (.140in nominal, 4.200in bore) provides reliable multi-layer sealing for high-output engines. Embossed stainless outer layers are coated with Viton for heat resistance while an uncoated stainless center shim adapts thickness. No sealants are required; the design withstands material shear, conforms load distribution and reduces clamp-induced bore distortion.
Cometic Chevrolet 348/409 W-Series Big Block V8 .140in MLS Cylinder Head Gasket - 4.200in Bore
