GM LSX MLX Head Gasket RH 4.100 .040

The GM LSX MLX Head Gasket RH 4.100 .040 from Cometic Gaskets is a precision-engineered sealing component purpose-built for high-performance LS engine builds and modifications. This right-hand head gasket is essential for builders and enthusiasts pushing their Gen III or Gen IV LS-platform engines beyond stock specifications, whether for street performance, track duty, or competitive motorsports. Cometic has engineered this gasket to handle elevated combustion pressures and temperature swings that stock gaskets simply cannot sustain.

The .040-inch compressed thickness and 4.100-inch bore specification are critical dimensions that ensure proper clamping load distribution and repeatable sealing across the critical combustion chamber interface. Cometic's multi-layer steel (MLS) construction with elastomer facings provides superior conformability to cylinder head and block surfaces, even on modifications involving deck work, porting, or non-stock machining. The gasket's advanced coating technology resists corrosion and maintains integrity under constant thermal cycling—a must-have for turbo, supercharged, or naturally aspirated builds operating at sustained high RPM or boost levels.

Mechanics and engine builders installing this right-side gasket should verify that cylinder head surface finish meets Cometic's specification (typically 60–80 Ra microinches for optimal seal) and that all fasteners are torqued to OEM or modified engine builder specifications. This gasket is compatible with LSX and MLX heads on LS1, LS2, LS3, LS6, LS7, and LS9 platforms, making it a universal choice for comprehensive engine rebuilds. Proper installation with a quality gasket sealer on elastomer-faced sides ensures leak-free performance and maximum lifespan in extreme operating conditions.