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The Cometic MLS cylinder head gasket for Chevrolet 348/409 W-Series Big Block V8 (.066in nominal, 4.375in bore) is constructed from multiple stainless steel layers to provide robust sealing and corrosion resistance. Outer embossed layers are Viton-coated for high-temperature sealing while the center shim is uncoated stainless and can be varied for thickness. No sealants are required; it withstands mixed-material shear and helps distribute clamp load to reduce bore distortion.
Cometic Chevrolet 348/409 W-Series Big Block V8 .066in MLS Cylinder Head Gasket - 4.375in Bore
