4.150 MLX Head Gasket .040 GM LSX Race RH

The 4.150 MLX Head Gasket .040 GM LSX Race RH from Cometic Gaskets is purpose-built for high-performance LSX engine platforms demanding maximum reliability under extreme cylinder pressures. This right-hand gasket is engineered for serious racers, engine builders, and enthusiasts who refuse to compromise on combustion chamber sealing when running boosted or naturally aspirated race applications. Cometic's MLX technology represents the gold standard in aftermarket head gasket design, trusted by competitors and professional engine shops across drag racing, road racing, and performance street applications.

The .040-inch thickness designation specifies the gasket's compressed height, a critical dimension that directly affects combustion chamber volume and compression ratio—factors that impact peak pressure dynamics and detonation margin. The 4.150-inch bore size is optimized for LSX block geometry, ensuring precise sealing around the combustion chamber while the MLX composite facing provides superior heat resistance and maintains gasket crush over repeated thermal cycles. This design prevents hot spots at the cylinder walls and cylinder head interface, eliminating the risk of localized blow-by that commonly occurs with inferior gasket materials during high-boost or high-rpm operation.

Builders working with Gen III or Gen IV LSX engines—whether LS1, LS2, LS3, or LSA variants—depend on this gasket for boost-capable builds, supercharger installations, and nitrous applications where standard OEM gaskets fail prematurely. The right-hand designation ensures correct orientation during installation on the appropriate cylinder bank. Professional installation with proper torque sequencing and head resurfacing verification is essential to maximize gasket longevity and engine reliability, particularly in competition environments where engine failure is not an option.