Cometic Chevy Small Block 4.200 inch Bore .140 inch MLS-5 Head Gasket (w/All Steam Holes)

Starting with a compressed operating thickness of 0.140 inches, this Cometic Multi-Layer Steel (MLS) head gasket is built for serious sealing performance. It's specifically designed for Chevrolet Gen-1 Small Block V8 engines with a 4.200-inch bore, and it includes all the necessary steam holes to help manage heat. This gasket is a solid option for those rebuilding or upgrading their top end, especially when dealing with aluminum heads on either aluminum or cast iron blocks, as the multi-layer steel construction can handle the different expansion rates between these materials.

The construction here is key: multiple layers of stainless steel give this gasket increased strength and the ability to rebound, while also resisting corrosion. The outer layers are coated on both sides with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit. This advanced coating is designed to perform reliably in demanding sealing environments, load conditions, and on various surface finishes, meaning you won't need additional sealants for a maximum seal. The center layer is uncoated stainless steel, allowing for precise thickness control to meet specific engine build requirements.

This gasket fits a wide range of vehicles from the early 1980s, including popular models like the Chevrolet C10 and Camaro, as well as GMC trucks. It's a well-built component that aims to provide a reliable seal for high-output engine applications.