4.185 MLS Head Gasket .051 - GM LSX LH

The Cometic Gaskets 4.185 MLS Head Gasket .051 for GM LSX left-hand is a precision multi-layer steel cylinder head gasket engineered for high-performance LS-series engine builds. The .051-inch compression thickness is critical for matching OEM and aftermarket cylinder head combinations while maintaining proper combustion chamber sealing on the driver side of the block.

Cometic's multi-layer steel (MLS) construction provides superior gasket sealing compared to traditional composite designs, particularly under high-boost pressure and elevated combustion temperatures common in turbocharged, supercharged, and nitrous-oxide-equipped LSX motors. The 4.185-inch bore specification matches the standard LS cylinder head port size and is compatible with most LS-based long-block assemblies. The .051-inch thickness is essential for maintaining correct piston-to-valve clearance and compression ratio when used with compatible heads and blocks.

This gasket is designed for serious engine builders, performance shops, and LS platform enthusiasts preparing engines for street performance, racing, or forced-induction applications. The left-hand (LH) designation indicates this is the driver-side gasket; matching right-side gaskets must be purchased separately to complete a full head gasket set. Proper installation requires torque-to-yield head bolts, a clean sealing surface, and adherence to OEM or tuner torque specifications to ensure long-term reliability and prevent coolant or combustion gas leakage.