





04.5-05 GM 6.6L LLY Duramax DFC Remanufactured Tow/Haul HD Series Long Block Crate Engine
- Part Number: TH6604505LLYLBHD
- Est. Ship Time: Contact To Confirm Lead Time
$24,578.31
Available Options
More from this brand
Starting From $8,659.19
Starting From $6,653.38
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing.
The DFC Diesel Tow/Haul Series engine comes standard with all the upgrades found in the Street Series model as well as several enhancements to make this engine perfect for towing, hauling and performance applications up to 500 HP.
THIS BUILD CONSISTS OF:
Contains all upgrades of the Street Series and includes;
- DFC long block assembly
- ARP series 2000 head studs
- Stage 2 Performance camshaft
- Mahle Motorsports HD pistons
- DFC HD push rods
- Hamilton HD valve springs
- Added dowels to crankshaft for harmonic balancer and trigger gear assembly
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.
Engine Upgrades
During the remanufacturing process, DFC upgrades the Tow/Haul Series engines to give you a better performing and longer lasting engine. Each long block gets DFC HD Push Rods, ARP 2000 Series Head Studs, Mahle Motorsports HD Pistons, DFC push rods and Hamilton HD valve springs. The Tow/Haul HD Package adds a set of Wagler Forged Connecting Rods, Wager stage 1 alternate firing camshaft, Balanced rotating assembly, HD flexplate and ATI dampener and Callies Compstar crankshaft.
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.
Full Warranty Information:
DFC stands behind their
products with an industry leading 5 year/ 100,000 mile warranty.
Is this for commercial
use? If so terms may vary, please click here to review DFC's full warranty information.
Tow/Haul HD 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.
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.
Note: $500 Crate charge is included in core charge total. Engine shipping crate must be returned with core engine to receive full core credit.
Not available for sale in the state of California
Part number: TH6604505LLYLBHD

DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. Built for wor..
$8,659.19
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. FEATURESOur&n..
$9,961.90
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. The DFC Diese..
$12,052.94
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. Built for wor..
$6,653.38
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. FEATURESOur&n..
$7,391.24
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. The DFC Long ..
$9,503.70
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. FEATURESOur&n..
$10,759.80
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. The DFC Diese..
$10,930.44
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. FEATURESOur&n..
$11,705.43
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. THIS BUILD CO..
$21,162.15
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. The DFC Diese..
$14,104.09
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. The DFC ..
$10,934.44
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. FEATURESOur&n..
$11,705.46
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. THIS BUILD CO..
$21,162.15
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. FEATURESOur&n..
$11,093.97
Featuring a factory construction, the Mahle piston (standard, left bank) is an OEM replacement to your 2001-2005 GM 6.6L Duramax LB7/LLY. Each Mahle p..
$131.89
Featuring a factory construction, the Mahle Piston (Standard, Right Bank) is an OEM replacement to your 2001-2005 GM 6.6L Duramax LB7/LLY. Each Mahle ..
$131.89
Gator Fasteners Heavy Duty Main Studs are design to hold the bottom end of your 6.6L together whether you're building a tow rig, race truck or just a ..
$234.99
The Cometic C5883 MLS Head Gasket for your 2001-2007 GM 6.6L Duramax is comprised of multiple embossed layers of both viton coated and uncoated stainl..
Starting From $147.28
The Alliant AP0052 Head Gasket is a direct replacement for your 2001-2010 GM 6.6L Duramax. Alliant Power provides OEM quality, without the OEM price. ..
$40.47
If you are wanting to keep your 6.6L Duramax on the road for the long haul, you need the high quality parts like these Gator Fastener Rod Bolts. ..
$209.99
Restore lost power from the valvetrain in your 2001-2016 GM 6.6L Duramax with the XDP Pushrods 7/16" Competition & Race Performance XD316. The fac..
$378.95
Alliant Head installation kit for 04-10 GM 6.6L Duramax without headgaskets and without studs by Alliant Power.Part number: AP0063..
$574.54
Alliant Head installation kit for 04-10 GM 6.6L Duramax with ARP Studs; without headgaskets by Alliant Power.Part number: AP0046..
$1,413.91
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. Built for wor..
$8,659.19
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. FEATURESOur&n..
$9,961.90
DFC engines may take up to 14 weeks to ship. Please contact us to verify lead times if you are in a hurry, before purchasing. The DFC Diese..
$12,052.94
DHD's heavy duty balancer installer is a must for customers installing aftermarket dampers. Unlike the OE balancer, most performance Duramax dampers a..
$382.35
Replace your damaged or inoperative Duramax PCV valve with this all in one service kit from DHD. As your truck ages these diaphragms swell and distort..
$41.16
DHD's TORQ series studs provide the perfect blend of quality and value that all Motorsports enthusiast's seek. These studs are designed to provide mar..
$247.06