4.125 MLS Head Gasket .051 - GM LSX LH

The 4.125 MLS Head Gasket .051 - GM LSX LH from Cometic Gaskets is a precision cylinder head gasket engineered for GM LS-series and LSX engine platforms requiring driver-side sealing. This multi-layer steel gasket is essential for high-performance builds, street applications, and engine rebuilds where reliable combustion chamber sealing is non-negotiable. With a 4.125-inch bore diameter and 0.051-inch compression thickness, this gasket delivers OEM-equivalent performance for both naturally aspirated and forced-induction LS engines.

Cometic's multi-layer steel (MLS) construction provides superior gasket integrity compared to traditional materials, offering excellent thermal stability and consistent sealing across the combustion chamber. The 0.051-inch compression thickness is optimized to maintain proper compression ratios while ensuring effective sealing at the cylinder head-to-block interface—critical for preventing blow-by and coolant leakage. MLS gaskets are engineered to handle elevated boost pressures and cylinder pressures, making them the preferred choice for stroker builds and modified LS engines operating above stock specifications.

Engine builders, performance shops, and LS enthusiasts rely on Cometic's precision gasket sets when assembling or rebuilding LS and LSX engines for competition, street performance, or restorations. This left-hand (driver-side) gasket pairs with its right-hand counterpart to complete a full head gasket set. Proper torque specifications and surface preparation of both the block deck and cylinder head are essential during installation to maximize gasket lifespan and prevent premature failure. Ideal for LS1, LS2, LS3, LSA, and LSX platforms.