3.910 MLS Head Gasket .040 - GM LS1

The 3.910 MLS Head Gasket .040 - GM LS1 from Cometic Gaskets is a precision-engineered cylinder head gasket designed specifically for GM LS-series engine platforms. This multi-layer steel gasket serves a critical sealing function between the cylinder head and engine block, preventing combustion gases and coolant from escaping or mixing. Whether you're rebuilding a stock LS1 engine, upgrading performance components, or restoring a classic GM muscle car, this gasket ensures reliable compression containment and long-term durability under demanding engine conditions.

Manufactured using multi-layer steel (MLS) technology, the 3.910 MLS Head Gasket features a 0.040-inch compression thickness—a common specification for LS1 applications that balances compression ratio preservation with proper head clamp load distribution. The 3.910-inch bore diameter matches the LS1's cylinder head specifications exactly, ensuring precise sealing across all combustion chambers. MLS gasket construction delivers superior heat resistance, improved conformability to surface irregularities, and enhanced reusability compared to traditional cork or composite designs, making it the preferred choice for both OEM replacements and high-performance builds.

This gasket is ideal for LS1 engine builders, restoration specialists, and performance enthusiasts who demand OEM-quality sealing without compromise. Installation requires standard cylinder head bolt procedures and proper torque specifications to achieve full gasket effectiveness. The single-gasket unit (sold individually) allows users to purchase quantities matched to their specific engine configuration, whether for a complete rebuild or mid-life maintenance. Cometic's reputation for precision engineering ensures this head gasket will perform reliably across street, strip, and road racing applications where engine integrity is non-negotiable.