Cometic Chevrolet Mark-IV Big Block V8 .070in MLS Cylinder Head Gasket - 4.320in Bore

When you're rebuilding the top end of your Chevrolet Mark-IV Big Block V8, getting the head gasket seated right is crucial for sealing combustion pressure and coolant. This Multi-Layer Steel (MLS) gasket from Cometic is built for that job, offering a .070 inch compressed thickness and a 4.320 inch bore diameter, making it suitable for a wide range of classic and performance Chevrolet V8 applications, including models like the Impala, Chevelle, and C10 pickups from the 60s and 70s.

Cometic uses multiple layers of stainless steel for strength and corrosion resistance, which also allows the gasket to rebound and maintain a seal. The outer layers are coated with Viton, a heat-resistant rubber material that handles tough sealing environments and works well with both aluminum and cast iron blocks, and aluminum heads. This construction means you don't need additional sealants, and it's designed to handle the shearing forces that can occur between different block and head materials in high-output engines.