3.950 MLS RH Head Gasket .040 Dodge 5.7L Hemi

The 3.950 MLS RH head gasket .040 for Dodge 5.7L Hemi engines from Cometic Gaskets is engineered for builders and enthusiasts who demand reliability during high-performance modifications or engine rebuilds. This right-hand gasket serves as the critical seal between your cylinder head and engine block, preventing combustion gas and coolant leakage under boost, nitrous, or sustained high-RPM conditions. Whether you're freshening a stock Hemi or pushing power limits with forced induction, a quality MLS head gasket is non-negotiable for long-term durability and peace of mind.

Cometic's multi-layer steel (MLS) design uses spring-loaded stainless steel core layers with elastomer facing to maintain clamping force across thermal cycles and maintain compression sealing across a wide range of boost levels. The .040-inch thickness is precisely calculated to work with properly resurfaced or new cylinder heads and blocks, ensuring correct combustion chamber volume and valve timing geometry. MLS gaskets outperform traditional cork or composite gaskets because the metal layers resist blowout under extreme pressure while the facing prevents micro-leakage during idle and part-throttle operation—critical for both street and strip applications.

This gasket is the right-hand unit, meaning it fits the passenger side of your 5.7L Hemi block (you'll need a matching left-hand gasket for a complete set). It's ideal for 2003–2023 Dodge trucks, Chargers, Challengers, and Jeeps running the legendary Hemi platform—from stock 345 cubic-inch configurations to stroked and nitrous variants. Proper torque sequence, head bolt specification, and surface prep are essential for gasket longevity; always follow factory service manual procedures and consider upgraded ARP or TTY fasteners when rebuilding. Installation requires new head bolts and careful attention to bore cleanliness to ensure the gasket seals properly at all four corners and throughout the combustion chamber.