4.040 MLX Head Gasket .052 GM LS1/LS2/LS3/LS6

The 4.040 MLX Head Gasket .052 GM LS1/LS2/LS3/LS6 from Cometic Gaskets is a precision-engineered sealing solution designed for high-performance LS engine builds and street applications alike. This gasket serves as the critical seal between your cylinder head and engine block, preventing coolant and oil leakage while withstanding extreme combustion pressures. Whether you're rebuilding a stock LS engine, upgrading to forced induction, or chasing peak horsepower on the dyno, selecting the correct head gasket thickness is fundamental to engine reliability and longevity.

Cometic's MLX head gasket features a multi-layer steel construction that delivers superior clamp load retention and sealing performance across the full operating temperature range of modern LS powerplants. The .052-inch thickness is engineered for specific compression ratio and piston-to-head clearance requirements, making bore diameter and gasket thickness critical variables in your engine assembly. This 4.040-inch bore specification accommodates standard LS displacement engines and maintains consistent compression characteristics without sacrificing gasket integrity under sustained high-boost conditions or extended track use.

Serious LS enthusiasts—from mild street tuners to competition builders—trust Cometic gaskets to eliminate head gasket failures that compromise engine performance and cause costly downtime. Proper gasket selection requires matching both bore diameter and thickness to your specific build parameters; this 4.040 MLX .052 configuration is ideal for naturally aspirated and moderately boosted LS1, LS2, LS3, and LS6 applications where precision sealing and repeatability matter. Installation should follow OEM torque specifications and sequence patterns to ensure even clamping pressure and maximum seal life across all operating conditions.