4.410 MLS Head Gasket .040 - BBM

The 4.410 MLS Head Gasket .040 - BBM is a precision multi-layer steel cylinder head gasket engineered for Mopar B and RB-series big-block engines. Built for enthusiasts and professional mechanics rebuilding or refreshing high-performance powerplants, this gasket seals the critical interface between the cylinder head and engine block—one of the most demanding pressure points in any combustion chamber. Whether you're restoring a classic muscle car or upgrading an existing build, a quality head gasket is non-negotiable for leak-free operation, proper combustion chamber sealing, and reliable long-term performance.

This gasket features a 4.410-inch bore diameter specifically matched to Mopar B and RB-block applications, with a 0.040-inch compression thickness that balances sealing integrity with proper combustion chamber volume. The multi-layer steel (MLS) construction uses layered metallic material with elastomer coatings to resist blowout under extreme pressure, cylinder-to-cylinder temperature variation, and thermal cycling—essential for both street and competition engines. The thinner 0.040-inch profile helps preserve compression ratio and allows for tighter deck clearances on modified or honed blocks, critical when maximizing efficiency on a freshly built or rebuilt engine.

Ideal for Mopar B-series (426 Hemi, 440) and RB-series (413, 440, 460) engine swaps, restorations, and performance builds, this head gasket delivers dependable sealing in both carbureted and fuel-injected configurations. Installation requires proper torque sequencing and head bolt specs per your engine's factory service manual; ensure the cylinder head and block deck surfaces are clean and smooth before installation. This single gasket is sold individually—verify you need the correct quantity for your specific engine block before checkout.