The Cometic C5591-066 MLX Head Gasket for your 3.9L 4BT Cummins consists of multiple layers of stainless steel for increased strength. The MLX (Multi-Layer Stopper) gaskets utilize an integrated stopper layer to withstand the additional pressures of a diesel engine for improved combustion chamber sealing and clamp load around the cylinder without increasing bore distortion. Compressed operating thickness is .066. 



  • MLX Construction
  • 4.188" Gasket Bore
  • .066” Compressed Thickness 
  • Improved Sealing and Clamp Load
  • No Sealants or Re-Torque Required

Cometic MLX Head Gasket (3.9L 4BT Cummins)

SKU: C5591-066

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