4.125 MLS Head Gasket .040 Dodge 6.1L Hemi

The 4.125 MLS Head Gasket .040 Dodge 6.1L Hemi from COMETIC GASKETS is the premium sealing solution for high-performance 6.1L Hemi engine builds and rebuilds. Designed for enthusiasts and professional shops tackling engine modifications, cylinder head work, or complete overhauls, this multi-layer steel gasket delivers the reliability and precision fit that modern forced-induction and naturally-aspirated Hemi applications demand. Whether you're upgrading fuel injectors, increasing boost pressure, or simply replacing a worn gasket during routine maintenance, this component is essential to preventing coolant and combustion leaks.

COMETIC's MLS (multi-layer steel) construction uses precisely engineered stainless-steel and spring-steel layers bonded with elastomer to maintain a consistent seal across thermal cycles and pressure spikes. The .040-inch compressed thickness is engineered to match OEM deck heights while accommodating the 4.125-inch bore diameter of the 6.1L platform, ensuring proper gasket crush and long-term sealing integrity. This thickness spec is critical: too thin and you risk blow-by; too thick and you alter compression ratios and cam timing. COMETIC's laser-cut design eliminates tolerance stack-up, providing repeatable results across multiple engine builds.

This head gasket is the go-to choice for 2005–2010 Dodge Magnum, Charger, and 300C owners running the 6.1L Hemi, as well as engine builders preparing stroker builds or supercharger installations. Installation requires standard head bolt torque sequences and a clean deck surface; always use fresh head bolts rated for your specific application to achieve proper clamp load. Pair this gasket with quality head studs and a torque wrench for optimal results, especially in boosted applications where peak cylinder pressures exceed stock specifications.