Cometic GM LS1 SB 4.130 inch Bore .051 inch MLS Head Gasket

This is a Cometic Multi-Layer Steel (MLS) head gasket designed for GM LS Gen-3 and Gen-4 small block V8 engines. It features a 4.130-inch bore and a compressed thickness of .051 inches. MLS gaskets are built with multiple layers of stainless steel, giving them increased strength and the ability to rebound, which helps them resist corrosion and maintain a seal under stress. The outer layers are coated with Viton, a heat-resistant rubber material that can handle demanding sealing environments and various surface finishes without needing additional sealants. This makes them a solid choice for applications using aluminum heads with either aluminum or cast iron blocks, as they can manage the shearing forces between different metals.

The multi-layer construction provides enhanced sealing performance, crucial for today's high-output engines. The center shim layer is uncoated stainless steel and can be varied to achieve different thickness requirements, though this specific gasket is set at .051 inches. This gasket fits a wide range of GM vehicles, including models like the Chevrolet Corvette, Camaro, Silverado, and Cadillac CTS, among many others. It's designed to provide a reliable seal right out of the box.