DFC Diesel 5.9 DODGE CUMMINS TOW HAUL SERIES AUTO SPEED OF AIR LONG BLOCK 04.5-07 - TH5904507AUSOALB

The DFC Diesel TH5904507AUSOALB Tow/Haul Series Long Block is built for serious towing and hauling, supporting performance builds up to 700 HP. It features internal upgrades such as Total Seal gapless piston rings, ceramic-coated piston crowns for heat management, heavy-duty valve springs, and a Stage 3 camshaft for crisp throttle response. It is precision-crafted with CNC-machined components using Rottler equipment for factory-spec tolerances. The assembly includes a fully machined block with over-sized pistons, new OEM or equivalent gaskets, and a reconditioned cylinder head with new valves, guides, and seats. ARP Series 2000 or OptiTorque head studs and a Cometic MLS gasket set prevent head lift under boost. Dry film lubrication on piston skirts reduces friction and extends lifespan. Backed by a 5-year, 160,000 km warranty.