Multiple U.S. Warehouse LocationsBroken ApexFree shipping on qualified orders over $100*
The Cometic Cummins 3.9L 4BT top-end gasket kit includes a .067" MLX cylinder head gasket for a 4.100" bore and the seals necessary for a top-end rebuild. StreetPro kits are offered as top‑end or bottom‑end sets; buying both covers a full engine overhaul and keeps materials consistent across the job. MLX gaskets incorporate an integrated stopper layer for combustion chamber sealing and improve clamp load without increasing bore distortion.
Cometic Cummins 3.9L 4BT Top End Gasket Kit - 4.100in Bore - .067in MLX Cylinder Head Gasket
