Cometic GM LS1 SB 3.910 inch Bore .066 inch MLS-5 Head Gasket

Cometic has built a solid reputation for making well-built gaskets, and this Multi-Layer Steel (MLS) head gasket is a prime example. It’s designed for GM LS Gen-3 and Gen-4 small block V8 engines, fitting a wide range of vehicles like the Chevrolet Corvette, GMC Sierra 1500, and Cadillac CTS. If you’re working on a high-output LS engine, this gasket is built to handle the pressure and heat, ensuring a reliable seal between your cylinder head and block.

This gasket is constructed from multiple layers of stainless steel, giving it increased strength and the ability to rebound, which helps it resist corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F (250°C). This makes it suitable for sealing aluminum heads to aluminum blocks or aluminum heads to cast iron blocks, as it can manage the shearing forces that can occur between different metals. The compressed operating thickness is 0.066 inches, with a bore size of 3.910 inches, ensuring it matches the specifications for many popular LS applications. Because it’s an MLS gasket, it doesn’t require any additional sealants, simplifying the installation process.