4.280 MLS Head Gasket .027 - 426 Hemi

The 4.280 MLS Head Gasket .027 - 426 Hemi from Cometic Gaskets is a precision-engineered cylinder head gasket engineered for legendary Mopar 426 Hemi engines. This gasket is essential for builders, restorers, and performance enthusiasts who demand reliability in high-compression, high-horsepower applications. The 426 Hemi's uncompromising power output requires gasket technology that matches its combustion pressures and thermal cycling demands, making OEM-quality replacement or upgrade gaskets critical to engine longevity.

Constructed from multi-layer steel (MLS) construction, this Cometic gasket delivers superior sealing performance compared to conventional composite designs. The MLS design features precisely embossed layers that create a conformable, leak-free seal even under extreme combustion pressures and thermal stress. At 0.027 inch compression thickness, this gasket is calibrated to maintain proper combustion chamber volume and compression ratio specific to the 426 Hemi platform—a critical factor in maximizing power output while preventing detonation. The 4.280 inch bore diameter is matched exactly to Mopar 426 Hemi cylinder head specifications, ensuring proper gasket seating and bore coverage across all firing pressures.

This gasket is ideal for engine rebuilds, stroker conversions, and high-performance restorations of classic Mopar vehicles powered by the iconic 426 Hemi. Whether you're rebuilding a warehouse-stock engine or upgrading with modern ignition and fuel systems, this Cometic gasket provides the durability and consistency required for trouble-free operation. Installation is straightforward during any cylinder head service—simply position the gasket on the block deck and torque the head bolts to manufacturer specification. Cometic's proven track record in extreme motorsports and street performance applications ensures this gasket will seal reliably through countless heat cycles.