Cometic 09+ GM LS9 4.100in Bore .040 thick MLS RHS Head Gasket

Starting with the Viton rubber coating on the embossed outer layers, this Cometic Multi-Layer Steel (MLS) head gasket is built to handle the heat and pressure of high-output engines. The Viton material is a tough elastomer that can withstand temperatures up to 482 degrees Fahrenheit, making it ideal for demanding sealing environments and various surface finishes you might encounter when rebuilding or modifying your engine.

This gasket features a 4.100-inch bore and a compressed thickness of 0.098 inches, with the specific 0.040-inch thickness achieved by the center shim layer. Its multi-layer stainless steel construction offers increased strength and the ability to rebound, which helps resist corrosion and withstand the shearing forces between aluminum heads and cast iron blocks. Because it's an MLS gasket, it seals effectively without needing any additional sealants, simplifying installation for both aluminum-to-aluminum and aluminum-to-cast iron setups.