SS599497SOALB Street Series Speed of Air Long Block (STD/Auto)

Features:

• Fits 1994–1997 5.9L Cummins 12V engines
• Complete long block with top end gaskets
• Includes reman cylinder head with new components
• Built with all new OEM or equivalent parts
• Machined using advanced Rottler CNC equipment
• Features ARP or OptiTorque head studs
• Includes Total Seal gapless piston rings
• Uses Cometic MLS multi-layer steel head gasket
• Improved gasket sealing in known leak areas
• Upgraded piston cooling reduces injector damage
• 5-year/160,000 km (100,000 mi) limited warranty

Breathe New Life Into Your 12-Valve Cummins

If you're rebuilding a 1994–1997 5.9L Cummins 12V and want something that goes beyond stock reliability, the DFC Diesel Street Series Speed of Air Long Block is a powerhouse built to handle the demands of daily driving, towing, and even the weekend warrior’s need for speed. This isn’t a patch job or a slapped-together reman—it’s a completely re-engineered long block that comes assembled with precision and purpose. From the professionally machined block and bored cylinders to the remanufactured head packed with new valves, guides, seals, and hardened seats, every inch of this engine is optimized for durability and performance. It’s topped off with a complete top-end gasket kit, so you’re set up for a smooth install right out of the crate.

Upgraded Inside and Out for Lasting Performance

DFC’s Street Series isn’t just about bringing your engine back to life—it’s about addressing the weak points that plagued these motors from the factory. You’ll find upgraded sealing methods in the areas most prone to leaks, along with ARP or OptiTorque head studs to hold everything down under pressure. Each engine is assembled using only brand-name components that meet or exceed OEM specs, including Total Seal gapless piston rings and Cometic MLS head gaskets. Enhanced piston cooling helps prevent damage from overheated injectors, and the entire assembly is backed by one of the strongest warranties in the business—5 years or 160,000 kilometers. Whether your Cummins powers a hard-working tow rig or a clean street build, this long block delivers the reliability and peace of mind that serious diesel owners demand.

Fits: 1994, 1995, 1996, 1997 Dodge RAM 5.9L Cummins 12V

Product Image Note: Some images may be representative.