4.185 MLS Head Gasket .040 - GM LSX RH

The Cometic Gaskets 4.185 MLS Head Gasket .040 - GM LSX RH is engineered for serious LS engine builders and performance enthusiasts who demand reliability in high-horsepower applications. This multi-layer steel gasket is designed specifically for the right-hand (passenger side) cylinder head on GM LS-series engines, making it essential for anyone rebuilding or refreshing their block. Whether you're assembling a street performance build or preparing a dedicated track engine, this gasket ensures a proper seal between the cylinder head and block under extreme combustion pressures.

Constructed with Cometic's proven multi-layer steel (MLS) technology, the 4.185 bore diameter and 0.040-inch compression thickness provide optimal sealing surface contact and heat dissipation characteristics essential for modern high-boost and naturally aspirated builds. The MLS design eliminates the risk of head gasket failure common in older single-layer gaskets, offering superior durability across repeated thermal cycles. At 0.040 inches thick, this gasket maintains precise head height specifications while accommodating the compression ratio and port flow characteristics of your specific LS platform, whether you're running stock heads or highly ported castings.

This right-hand gasket is compatible with all fourth and fifth-generation LS-platform engines, including the LS1, LS2, LS3, LS7, LSX, and related variants used in Corvettes, Camaros, Silverados, and engine swaps. Installation requires standard head-bolt torquing procedures and a clean deck surface; the gasket's 9.65 x 23.9-inch footprint ensures fitment across the full combustion chamber area. Mechanics and engine builders consistently specify Cometic MLS gaskets for both OEM replacement and modified engine applications where reliability cannot be compromised.