4.185 MLS Head Gasket .045 GM LSX RH

The 4.185 MLS Head Gasket .045 GM LSX RH from Cometic Gaskets is designed for serious LSX engine builders and enthusiasts who are pushing high compression ratios and aggressive boost levels. This multi-layer steel (MLS) gasket is specifically made for the right-hand cylinder head, making it ideal for Gen III, Gen IV, and LS-platform engine swaps where OEM gaskets may not meet reliability demands.

The MLS design utilizes multiple layers of spring steel with an elastomer coating, providing superior conformability and load retention compared to traditional composite gaskets. With a thickness of .045 inches, it is engineered for the 4.185-inch bore diameter, ensuring optimal clamp load distribution across the sealing surface while maintaining head gasket volume and not negatively impacting the compression ratio.

This gasket is particularly beneficial for performance street engines or dedicated track platforms, as it maintains sealing integrity even under high-temperature cycling, which is critical for turbocharged, supercharged, or naturally aspirated builds exceeding 400 horsepower. Its resistance to coolant and oil intrusion makes it a preferred choice for engine builders demanding durability and reliability.