Cometic Chevrolet 348/409 W-Series Big Block V8 .030in MLS Cylinder Head Gasket - 4.375in Bore

Cometic Gasket is well-known for making solid sealing solutions, and this Multi-Layer Steel (MLS) head gasket is a prime example. It's built for Chevrolet's 348/409 W-Series Big Block V8 engines, specifically designed to handle the demands of high-output builds. This gasket is a .030 inch undersize version with a 4.375 inch bore, intended for engines where that specific bore size and clearance are needed.

What makes these MLS gaskets stand out is their construction. They're made from multiple layers of stainless steel, which gives them strength and helps them resist corrosion. The outer layers are embossed and coated with Viton, a heat-resistant rubber material that can handle tough sealing environments and various surface finishes. This coating means you don't need to use any extra sealants; the gasket is ready to seal right out of the box. The center layer is also stainless steel, and its thickness can be varied to meet different compression requirements, with this particular gasket having a compressed thickness of 0.036 inches.

This type of gasket is a good choice whether you're pairing aluminum heads with an aluminum block or aluminum heads with a cast iron block, as it's designed to manage the stresses that can occur between different metals. It fits a range of classic Chevrolet vehicles, including models like the Impala, Bel Air, and C10 Pickup from the late 1950s and early 1960s.