4.185 MLS Head Gasket .051 - GM LSX LH

The Cometic Gaskets 4.185 MLS Head Gasket .051 for GM LSX LH is a precision-engineered sealing component designed for high-performance and modified LS-based engines. This multi-layer steel (MLS) head gasket is essential for builders and mechanics tackling serious engine builds, from naturally aspirated strokers to supercharged and turbocharged applications.

The .051-inch compressed thickness targets specific combustion chamber volumes and compression ratios, making it critical for matching your engine's exact architecture and performance goals. MLS gasket technology uses multiple layers of spring steel with elastomer coatings to create a superior seal under extreme pressure and temperature cycles. This three-layer construction maintains clamp load across repeated heat expansion and contraction—critical for boosted applications where cylinder pressure spikes and thermal stress demand uncompromising reliability.

The 4.185-inch bore diameter is precisely calculated for LSX engine families, and the left-hand (LH) designation ensures proper port alignment on the driver's side cylinder head. Cometic's reputation for quality control means consistent thickness tolerances and superior surface finishes that protect against head-to-block micro-leakage. This gasket is indispensable for LS engine rebuilds where compression ratio precision matters—whether you're assembling a street engine, road-race platform, or dedicated drag-strip application.