DFC engines may take 2-8 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing.
The DFC Street Series Long Block Engine is built for the diesel enthusiast who is looking to replace the tired or damaged engine in their 2004.5-2005 GM 6.6L Duramax LLY with one of the industry’s top remanufactured Long Blocks. DFC makes important improvements during the remanufacturing process to maintain reliability even with applications that have higher horsepower. DFC focuses on upgrading Duramax weak points that come from the factory such as an EDM oil pump shaft with a hardened dowel and a Woodruff Keyed camshaft installed to prevent slipping the risk of an oil pressure loss. DFC uses Rottler machining equipment that allows for tolerances that are tighter than OEM specification and checks every core before the build process. DFC choses the best cores and rejects any components that require considerable “restoring” to maintain the highest standards possible.
The DFC short block is machined with 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, doweled oil pump, bearings, and rods.
Unlike some others 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 for diesel enthusiasts. DFC stands behind their 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, doweled 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.
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.
Note: $500 Crate charge is included in core charge total. Engine shipping crate must be returned with core engine to receive full core credit.
Part number: SS6604505LLYLB