DFC Diesel TH5904507STSOALB Tow/Haul Series Standard Speed Of Air Long Block | 2004.5-2007 Dodge RAM 5.9L Cummins

Features:

• Built for 2004.5-2007 5.9L Cummins engines
• Rated for up to 700 horsepower builds
• Includes Stage 3 performance camshaft
• Heavy-duty Manton push rods installed
• Total Seal gapless piston rings included
• ARP or OptiTorque head studs installed
• Cometic MLS head gasket for better sealing
• Machined using precision Rottler CNC equipment
• All-new name-brand internals used throughout
• Ceramic coated piston crowns for heat control
• Dry film coated piston skirts for longevity
• Backed by 5-year, 160,000 km warranty

Get Your Truck Back To Work With Confidence

If your 2004.5-2007 5.9L Dodge Cummins is down and out, this DFC Tow/Haul Series Standard Long Block is your fast track to reliable power and serious pulling strength. Designed for workhorses that live on the job site or haul heavy loads on the regular, it brings all the muscle you need without cutting corners. Built for up to 700 horsepower, this long block includes internal upgrades like a Stage 3 camshaft and Total Seal gapless piston rings that help improve power delivery and reduce blow-by. Manton HD push rods and heavy-duty valve springs give the valvetrain extra stability under pressure, keeping performance smooth when it matters most. The pistons are ceramic coated to handle high temperatures, while the dry film coating on the skirts helps reduce friction and wear over time. Whether you're towing a fifth wheel or loading down a flatbed, this engine is built to stay strong under stress. And with a 5-year, 160,000 km warranty behind it, you can hit the road with peace of mind and zero hesitation.

Precision Built For Long Term Durability And Power

Every detail of the DFC Diesel Tow/Haul Series Standard Long Block is engineered to meet or exceed OEM standards, ensuring a rock-solid foundation for your Cummins build. The block is bored and machined for over-sized pistons, then fitted with new OEM or equivalent internals to restore factory performance with added strength. Cylinder heads are fully remanufactured with new valves, guides, and seats, plus they’re resurfaced and magnafluxed to confirm structural integrity. Rottler CNC machining ensures tight tolerances from top to bottom, which is crucial for long-term reliability and consistent power delivery. The use of ARP Series 2000 or OptiTorque head studs provides exceptional clamping force to secure the top end under boost. A Cometic MLS head gasket adds another layer of reliability by sealing in combustion pressures under heavy load. Paired with the Stage 3 camshaft and upgraded valvetrain, this long block is ready to handle high-stress applications without flinching. It's a complete, drop-in-ready package for builders who value craftsmanship and consistency.

Fits: 2004.5, 2005, 2006, 2007 Dodge RAM 5.9L Cummins

Notes:

• Designed for 2004.5-2007 5.9L Dodge Cummins applications
• Standard transmission compatibility only, not for automatic
• Built for towing, hauling, and performance up to 700 HP
• Includes both short block and remanufactured cylinder head
• All components meet or exceed OEM specifications
• Head studs brand may vary based on availability
• Valve spring rating varies by model year range
• Requires professional installation and proper break-in
• Machined using Rottler CNC for precision and reliability
• Backed by a 5-year or 160,000 km warranty
• Engine build includes upgraded internals for longevity
• Designed to be a direct-fit long block replacement

Street Series vs Tow/Haul vs Tow/Haul HD

• Street Series: Ideal for daily driving, light work, and diesel enthusiasts. Focuses on reliability upgrades over stock, with head stud and sealing improvements.

• Tow/Haul Series: All Street upgrades plus added performance parts for higher load and towing power. Supports builds up to ~700 HP.

• Tow/Haul HD Series: The most robust option. Adds heavy-duty internals like Wagler rods and a balanced rotating assembly for 800+ HP capability.

Standard/Auto vs Standard vs Auto

• Standard/Auto: Compatible with both manual and automatic transmissions. Offers the most flexibility.

• Standard: Built specifically for manual transmission configurations.

• Auto: Built specifically for automatic transmission setups.