4.150 MLX Head Gasket .040 GM LSX Race LH

The Cometic Gaskets 4.150 MLX Head Gasket .040 GM LSX Race LH is a precision multi-layer steel cylinder head gasket engineered for high-performance LS-series engine builds. Designed specifically for driver-side (left-hand) applications on GM LSX racing platforms, this gasket delivers the sealing integrity demanded by serious engine builders and performance enthusiasts. Whether you're assembling a street stroker, track-focused powerplant, or competition engine, this OEM-quality gasket ensures reliable combustion chamber sealing under extreme boost and high RPM conditions.

Constructed from multi-layer steel (MLS) construction, the 4.150 bore gasket features a 0.040-inch compression thickness that optimizes piston-to-valve clearance and combustion chamber volume critical for tuning and performance calibration. The six-bolt head design provides maximum clamping force distribution across the cylinder head surface, preventing blow-by and coolant leakage even under sustained high-boost applications. Cometic's precision manufacturing tolerances ensure consistent bore geometry and surface contact pressure, eliminating hot spots and cold zones that compromise gasket life in racing engines.

This gasket is ideal for LS1, LS2, LS3, LS6, and LSX engine platforms used in performance vehicles, circle track racers, and drag racing applications. Installation requires proper head bolt torque sequencing and surface prep—cylinder heads and block decks must be cleaned to bare metal and checked for flatness to specification. Available as a single unit (each), this replacement or upgrade gasket is essential for any rebuild, displacement increase, or forced-induction modification on LS-based platforms. Always verify bore size and head bolt configuration before ordering to ensure correct fitment.