Gen III Hemi RH MLX Head Gasket 4.000 Bore .040

The Gen III Hemi RH MLX Head Gasket 4.000 Bore .040 is designed specifically for Mopar Gen III Hemi engines that require OEM-specification cylinder head sealing. This gasket is essential for engine builders, performance shops, and technicians working on Gen III Hemi platforms used in trucks, SUVs, and muscle cars.

Engineered for reliable compression retention, this gasket prevents coolant or oil seepage at the critical cylinder head-to-block interface. The 4.000-inch bore diameter aligns with late-generation Hemi displacement specifications, while the .040-inch compression thickness is the standard for this platform. Its multi-layer steel construction offers superior resealing capability compared to single-layer designs, ensuring sealing integrity under extreme conditions.

Using the correct OEM gasket thickness and material composition is crucial to prevent common failures like head gasket blow-out or internal coolant leaks. This gasket is ideal for those rebuilding after high-mileage wear, upgrading induction systems, or restoring original performance specifications. Ensure proper fitment during assembly with the right-hand passenger-side orientation to avoid misalignment at the head surface.