DFC Diesel Remanufactured Street Series Long Block for 2001-2016 6.6L Duramax LB7 LLY LBZ LMM LML

DFC Diesel Remanufactured Street Series Long Block for 2001-2016 6.6L Duramax LB7 LLY LBZ LMM LML

SKU: DFC Diesel Street Series Long Block 01-16 6.6L Duramax   ITEM NO: 173028

Price: $7,377.89$9,509.99

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DFC Diesel Remanufactured Street Series Long Block


2001-2016 6.6L Duramax LB7 LLY LBZ LMM LML

The DFC Remanufactured Street Series Long Block Engine is a perfect replacement engine for your GM 6.6L Duramax. DFC commits to its high standards by making crucial improvements during the remanufacturing process to maintain reliability, even with applications that have additional horsepower over stock. DFC focuses on upgrading Duramax’s known weak points from the factory, such as adding an EDM oil pump shaft with a hardened dowel to prevent slipping and the risk of oil pressure loss. DFC checks every core before the build process and uses Rottler machining equipment that allows for tolerances that are tighter and more precise than OEM specifications. DFC chooses only the best cores and rejects any components that require considerable “restoring” as a way to maintain the highest standards possible.

Engine Remanufacturing

The DFC short block is machined with a near-identical weight piston and connecting rod assemblies to help you get a smoother running engine that makes less noise and is more balanced. DFC short blocks include reinforced internals with new pistons, rings, dowelled oil pumps, bearings, and rods.

Cylinder Head

Unlike some other engine builders in the industry that re-use wearing items like valves and valves guides, DFC installs all new valves from high-quality sources like MAHLE or SBI and replaces each valve guide with a new cast guide in every cylinder head. To address common cracking areas in the cylinder head, DFC also machines each head to remove the factory hardened seat material. DFC then installs new SBI valve seats to help eliminate premature cracking, giving you a more durable cylinder head.


DFC engines are remanufactured by diesel enthusiasts by diesel enthusiasts. DFC stands behind its products with one of the industry’s leading 5 year 100,000 mile warranty.

Street Series 6.6L Long Block Includes:

Complete short block with the front cover and seal, rear cover with main seal, oil pan, all new internal components, cylinder heads with all rockers and pushrods installed, dowelled oil pump gear, woodruff keyed camshaft and complete gasket kit for installation.


  • Remanufactured Long Block Engine
  • Upgraded EDM Oil Pump Shaft & Hardened Dowel
  • Improved Gasket Sealing Methods In Common Leak Areas

New Engine Checklist (Replacement Items – Sold Separately):

  • Oil Cooler – highly recommended and mandatory if your past engine had a bearing failure.
  • Injectors – highly recommended especially on higher model engines or engines with contaminated fuel.
  • Turbocharger – recommended if mileage over 125K, mandatory if shaft play, or if engine was dusted.
  • Water Pump – highly recommended if engine has over 125K.
  • Evans Waterless Coolant – recommended upgrade to prevent corrosion and boilover.

Application Note:

The specific brand of each component may change due to part availability at the time of each build. Parts are chosen at the discretion of DFC and cannot be specially requested. DFC uses only the best components sourced from multiple brands during the remanufacturing process and backs their engines with an industry-leading 5-year 100,000 mile warranty.


$500 Crate charge is included in the core charge total. Engine shipping crate must be returned with core engine to receive full core credit. The price listed includes pre-paid shipping for the core return of $350 and a $200 oversize shipping fee.

Additional information


Manufacturer Part Number

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1 Year


Year Range

2001-2004 LB7, 2004.5-2005 LLY, 2006-2007 LBZ, 2007.5-2010 LMM, 2011-2016 LML

Weight 700 lbs
Dimensions 36 × 46 × 36 in
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