Cometic GM LB7/LLY/LBZ/LMM/LGH/LML Duramax .140in MLS Cylinder Head Gasket - 4.100in Bore - RHS

Starting with a .140 inch thickness and a 4.100 inch bore, this Cometic Multi-Layer Steel (MLS) head gasket is built for serious sealing performance on GM Duramax engines. Specifically designed for the LB7, LLY, LBZ, LMM, LGH, and LML platforms, it’s constructed from multiple layers of stainless steel. This design inherently resists corrosion and provides the strength needed to handle the high output these engines are known for, making it suitable for both aluminum and cast iron block combinations.

The outer layers of this gasket are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit. This coating, applied on both sides, ensures a tight seal against the cylinder head and block surfaces without needing any additional sealants. The center layer is also stainless steel, and its thickness can be varied to meet different sealing requirements, which is how this gasket achieves its specific .140 inch compressed thickness.

This gasket fits a wide range of GM trucks and vans, including models like the Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD. It’s a well-built component designed to maintain sealing integrity under demanding conditions.