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.
Engine Remanufacturing
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.
Cylinder Head
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.
Warranty
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 (Non-Commercial).
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.
FEATURES:
- 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.
Applications:
2004.5-2005 Chevrolet Silverado 2500HD/3500HD (6.6 Duramax LLY)
2004.5-2005 GMC Sierra 2500HD/3500HD (6.6 Duramax LLY)
2004.5-2005 Chevrolet Silverado 2500HD/3500HD (6.6 Duramax LLY)
2004.5-2005 GMC Sierra 2500HD/3500HD (6.6 Duramax LLY)
Shipping Restrictions Apply 
This product can not be shipped to these states: CA
This product can not be shipped to these states: CA
Note: $500 Crate charge is included in core charge total. Engine shipping crate must be returned with core engine to receive full core credit.
Product Returns
Product Return Policy
- Returns must be packaged securely in an outer carton
- Do not write on the product packaging itself. Write only on the outer shipping carton.
- Packages received without a Return Authorization Number written clearly on the outer carton will be refused.
- Returnable items must be received by SUP within 30 days of the product being received by you the customer. (determined by tracking number)
- Returned product must be in new, re-saleable condition, with all original boxes, packaging, parts, cables, manuals, etc.
- Upon receipt, all returns will be inspected, and, at our discretion, credit may be refused or a restocking fee of 5%-10% may be assessed.
- Original shipping cost and shipping protection charges are non-refundable.
- Customer is responsible for shipping costs incurred to return products.
- Products can only be returned for a refund, store credit, or an exchange for the same item. Product cannot be exchanged for a different part number.
Some Circumstances in which credit will not be issued but not limited to:
- Product has been installed and/or used
- Product has been damaged from an attempt to be installed and/or used
- Product is shipped back without original box, manual and/or parts
- Seal on electrical parts is broken
- Product serial number does not match that of which was original shipped to buyer
- Product is deemed not resell able by SUP due to customers own actions in dealing with the product
Core Returns
Core Return Instructions: STOP! Please read to avoid costly delays!
- Step 1: Verify the core will be received back within 30 days. (See Deadline)
- Step 2: Fill out the Return Form.
- Step 3: Wait for return instructions. SUP will email a return number (RMA) and a return shipping address. Many cores will be sent directly back to the manufacturer, so please read the instructions.
- Step 4: Package the core. Good packaging prevents costly damage and/or the core being refused by the shipping carrier. It may be possible to reuse the box your original product came in. If not, use a box strong enough to support the product. Seal the product in a plastic bag to prevent leaks. Cushion the product with packing material and securely seal the package with tape.
- Step 5: Attach the shipping label you have purchased (see return shipping policy) and write the return number (RMA) large and clear on the outside of the box.
- Step 6: Ship the core.
Core Return Policy *** Important Please Read ***
Deadline: Core returns will only be accepted within 30 days of receiving the original product. After 30 days core credit refunds will be at the discretion of SUP.
Refund Policy: Returns made between 0-30 days are eligible for credit back to the original payment method used for the purchase. Credit may be full, partial, or denied based on the acceptance policy below. Please allow up to 4 weeks after the core is received for inspection and refund if accepted.
Return Shipping Policy: Core return shipping is the responsibility of the customer. SUP recommends using a carrier that provides package tracking and insurance. You will not be reimbursed for shipping costs incurred in shipping the core. SUP is not responsible for cores received damaged, freight penalties, and/or lost shipments.
Acceptance Policy:
- No leaking fluids, all fluids must be drained, and the core must be sealed in a plastic bag.
- The core returned must be a like-for-like make, model, type, and part number.
- Cores will not be accepted from a salvage or junkyard.
- Cores must not be disassembled or have missing and/or damaged major components.
- Cores must be in rebuildable condition.
Core refund acceptance is at the discretion of SUP and the manufacturer/remanufacture or the original product. Failure to follow the above policy may result in partial credit and/or no credit being issued. If you would like a core returned that has been denied acceptance, you may request that within 30 days and pay for return shipping. Cores that have not been accepted and are unclaimed by the customer after 30 day will be destroyed and disposed of.
Updated 08/22/2024
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