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The Cometic MLS cylinder head gasket for Chevrolet 348/409 W-Series Big Block V8 (.045in nominal, 4.375in bore) uses multiple embossed stainless steel layers to deliver reliable sealing for high-output engines. Outer layers are coated with Viton for heat and sealing resilience while the uncoated stainless center shim can be adjusted for thickness. No sealants are required; the gasket resists corrosion, withstands shearing between dissimilar metals and helps limit bore distortion.
Cometic Chevrolet 348/409 W-Series Big Block V8 .045in MLS Cylinder Head Gasket - 4.375in Bore
