Cometic GM LS1 SB 3.970 inch Bore .051 inch MLS Head Gasket

If you're working on a GM LS Gen-3 or Gen-4 small block V8 engine, this Cometic Multi-Layer Steel (MLS) head gasket is a solid choice for sealing your cylinder heads. It's designed with a 3.970-inch bore and a compressed thickness of 0.051 inches, making it suitable for a wide range of popular GM vehicles like the Chevrolet Corvette, Silverado, and GMC Sierra.

Cometic builds these gaskets with multiple layers of stainless steel for increased strength and rebound resistance. The outer layers are coated with Viton, a heat-resistant rubber material that can handle high temperatures up to 482°F (250°C) and works well with both aluminum and cast iron blocks. This construction means you don't need to use any additional sealants, and the gasket can handle the stresses between different metal types. The center layer is also stainless steel and can be varied to achieve different thicknesses, though this specific gasket is set at 0.051 inches compressed.