4.040 MLS Head Gasket .040 - SBC LT1

The 4.040 MLS Head Gasket .040 - SBC LT1 from Cometic Gaskets is designed for small-block and LT1 Chevrolet engine builders who prioritize reliability under high combustion pressures. This gasket is ideal for applications requiring precise bore-matched sealing, such as rebores and stroker builds.

Constructed from Multi-Layer Steel (MLS), this gasket features alternating steel and elastomer layers that enhance gasket recovery and maintain clamping load across thermal cycles. The .040-inch thickness refers to the nominal thickness, which is suitable for stock or slightly raised deck heights on SBC and LT1 platforms.

This gasket is compatible with various SBC engines, including the 350, 355, and 383, as well as LT1 engines found in third-generation F-body vehicles. Its design helps ensure consistent compression ratios across all cylinders, making it a reliable choice for both street and performance applications.