DFC Diesel SS590304STAUSOALB Street Series Speed of Air Long Block Crate Engine (STD/Auto) | 2003-2004 Dodge RAM 5.9L Cummins

Features:

• Backed by 5-year, 160,000 km warranty
• Includes ARP or OptiTorque head studs
• Complete long block with head and gaskets
• Remanufactured with all new name-brand parts
• Built to exceed OEM specifications
• Preset rockers and pushrods for easy install
• Cometic MLS head gasket included standard
• Gapless Total Seal piston rings installed
• Advanced CNC machining ensures precision fit
• Upgraded gasket sealing in leak-prone zones
• Improved piston cooling reduces failure risks
• Fits 2003–2004 Dodge 5.9L Cummins (Auto/Std)

Upgrade Your 5.9 Cummins With Confidence

If your 2003-2004 Dodge 5.9L Cummins is showing its age, the DFC Diesel SS590304STAUSOALB Street Series Long Block Crate Engine offers the perfect path to renewed power and reliability. Designed specifically for work trucks, daily drivers, and diesel enthusiasts who demand more than just stock performance, this engine gives you confidence with every mile. It’s built with a full lineup of brand-new OEM or equivalent components, including pistons, rings, gaskets, and bearings, ensuring long-lasting durability from the inside out. Every unit is backed by one of the strongest warranties in the industry, a 5-year, 160,000 km promise that speaks volumes about DFC's build quality. Whether you tow heavy loads, haul gear, or simply need a solid daily driver, this long block delivers reliable performance without the guesswork. Rockers and pushrods come pre-set to factory specs, which means less time adjusting and more time driving. Plus, with head studs from ARP or OptiTorque already installed, this crate engine is built to handle higher cylinder pressures and aggressive driving.

Built With Precision To Outlast The Miles

This Street Series long block is not just a rebuild, it’s a full remanufactured upgrade designed to outperform factory specs in all the right ways. At the core is a professionally machined block that’s bored to accept the next oversized piston, delivering better compression consistency and longer engine life. The cylinder head is fully refreshed with all-new valves, guides, hardened seats, and stem seals, plus it’s magnafluxed and resurfaced to meet exacting standards. Total Seal gapless piston rings come standard, improving combustion and reducing blow-by, while a Cometic MLS head gasket adds superior sealing under high load. CNC machining by Rottler equipment guarantees precision in every cut, helping to reduce the chances of future wear or failure. You also get improved piston cooling to guard against injector-related failures, a common issue in older 5.9L Cummins engines. It’s compatible with both standard and automatic transmissions, making it a smart drop-in solution for a wide range of builds. From the components used to the care in assembly, this engine is all about long-term performance and worry-free driving.

Fits: 2003, 2004 Dodge RAM 5.9L Cummins

Notes:

• Core return may be required by manufacturer
• Engine is designed for 2003-2004 5.9L Cummins
• Compatible with both automatic and standard transmissions
• Street Series is intended for daily driving and towing
• Includes upgraded head studs depending on availability
• Long block does not include fuel system components
• Installation should be completed by a qualified technician
• Warranty coverage is 5 years or 160,000 km
• Engine includes all new internal wear components
• Built using advanced Rottler CNC machining equipment

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.