Cometic GM LS1 SB 3.970 inch Bore .040 inch MLS Head Gasket

Cometic Gasket is a well-known name for creating solid sealing solutions, and this Multi-Layer Steel (MLS) head gasket is a prime example. Designed for GM LS Gen-3/4 small block V8 engines, this gasket features a 3.970-inch bore and a compressed thickness of 0.040 inches. It's built to handle the demands of high-output engines, making it a popular choice for rebuilds and performance applications.

What sets this gasket apart is its construction. It's made from multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are embossed and coated with Viton, a heat-resistant rubber material capable of withstanding temperatures up to 482°F (250°C). This advanced coating ensures a reliable seal even in harsh environments and works well with both aluminum and cast iron blocks, preventing issues caused by the shearing forces between different metals. The center layer is uncoated stainless steel, allowing for precise thickness control.

This gasket fits a wide range of GM vehicles, including models like the Chevrolet Corvette, Cadillac CTS, and GMC Sierra 1500. Because it requires no additional sealants, installation is straightforward, making it a practical choice for many engine projects.