DFC Diesel SS5904507AUSOALB Street Series Auto Speed Of Air Long Block | 2004.5-2007 Dodge RAM 5.9L Cummins

Features:

• 5-Year / 100,000 Mile Warranty
• Built For Daily Drivers And Work Trucks
• Includes Cylinder Head And Gasket Kit
• All New Pistons, Rings, And Bearings
• Rottler CNC Machined For Precise Fitment
• Gapless Total Seal Piston Rings Standard
• Cometic MLS Head Gasket Included
• ARP Or OptiTorque Head Studs Installed
• Preset Rockers And Pushrods To Spec
• Improved Gasket Sealing In Weak Areas
• Designed For Automatic Transmission Builds
• Engineered To Reduce Piston Heat Failures

When Your Truck Deserves More Than Just A Rebuild

If your 2004.5-2007 Dodge Cummins is ready for a serious upgrade, the DFC Diesel SS5904507AUSOALB Street Series Long Block is built to deliver. This engine isn’t just a fix for a tired powerplant, it’s a purpose-built solution for diesel owners who rely on their trucks day in and day out. Whether you’re hauling trailers, heading to job sites, or simply want the peace of mind that comes from a high-quality remanufactured engine, this long block checks every box. It’s built using only new or OEM-equivalent components, so you’re not getting recycled internals or patchwork repairs. DFC includes top-tier upgrades like ARP or OptiTorque head studs and Cometic MLS head gaskets to fix the common issues these engines face over time. Even better, every unit is backed by a solid 5-year, 100,000-mile warranty, real confidence you can count on. For those who want reliability and performance from a name they can trust, this long block delivers both in one package.

Built With The Right Parts In All The Right Places

This Street Series Auto Long Block is engineered with a precise blend of high-quality components and advanced machining techniques to ensure long-term durability. Every block is professionally bored and machined using Rottler CNC equipment, providing exact tolerances for oversized pistons. Those pistons are matched with Total Seal gapless rings that improve compression and reduce blow-by under load. A fully remanufactured cylinder head comes standard and is built with new valves, seats, guides, and stem seals to eliminate the weak links in older engines. The rockers and pushrods are pre-set to factory specifications, which takes the guesswork out of installation and keeps the process smooth for the installer. Unlike basic rebuilds, this long block improves sealing in known problem areas, helping prevent oil leaks and head gasket failures down the road. Designed specifically for automatic transmission setups, it delivers reliable, everyday performance without sacrificing the toughness Cummins owners expect.

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

Notes:

• This is a long block, not a complete engine.
• Designed specifically for automatic transmission setups.
• Customer must transfer external components like turbo and injectors.
• Engine is remanufactured using all new or OEM-equivalent parts.
• Block is machined to accept next oversized pistons.
• Cylinder head is fully remanufactured and pressure tested.
• All machining performed using Rottler CNC equipment.
• Includes a full top-end gasket kit for installation.
• Core return required and must meet acceptance criteria.
• Street Series is optimized for daily driving and light-duty use.
• Warranty coverage is 5 years or 160,000 km (100,000 miles).
• Installation by a professional technician is strongly recommended.

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.