4.500 MLS Head Gasket .040 - 426 Hemi

The 4.500 MLS Head Gasket .040 - 426 Hemi from Cometic Gaskets is engineered for serious Mopar enthusiasts and professional engine builders who demand reliability in high-performance 426 Hemi applications. This multi-layer steel cylinder head gasket is the critical seal between your engine block and cylinder head, preventing combustion gas leakage and maintaining compression integrity under extreme operating conditions. Whether you're rebuilding a classic muscle car engine or servicing a performance platform, this gasket delivers the precision fit that separates amateur work from professional-grade results.

Cometic's multi-layer steel construction provides superior heat resistance and durability compared to conventional single-layer gaskets, essential when managing the extreme combustion pressures generated by a 426 Hemi engine. The 4.500-inch bore diameter and 0.040-inch compression thickness are precisely calculated to match factory 426 Hemi specifications, ensuring optimal sealing performance without compromising gasket crush or creating installation issues. The MLS (multi-layer steel) design incorporates specialized coatings and elastomer layers that maintain a consistent seal across thermal cycling, preventing the common failure modes associated with older gasket materials.

This gasket is essential for anyone rebuilding or resurfacing the cylinder head on a Mopar 426 Hemi platform, from restoration specialists to engine shops handling performance upgrades. Installation requires proper torque sequencing and adherence to manufacturer specifications to maximize seal effectiveness and longevity. Weighing 0.78 lbs and dimensioned at 9.7 × 0.25 × 23.95 inches, this single gasket is a direct replacement component that restores factory-specification compression and eliminates potential combustion leaks that compromise both power output and engine health.