DFC Diesel SS6604505LLYSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

Features:

• Includes premium Callies forged steel crankshaft
• Fits 2004.5-2005 6.6L Duramax LLY engines
• Backed by 5-year, 160,000 km warranty
• Ideal for daily driving and work use
• Remanufactured to exceed OEM specifications
• All-new pistons, rings, and gaskets included
• Fully rebuilt and resurfaced cylinder heads
• Comes with ARP or OptiTorque head studs
• Machined using advanced Rottler equipment
• Improved sealing in high-leakage areas
• Woodruff keyed camshaft adds crank stability
• Includes complete top-end gasket installation kit

Make Your Duramax Stronger Than It Ever Was

If you’re ready to rebuild your 2004.5-2005 GM or Chevy 2500HD or 3500HD with real confidence, this DFC Street Series Long Block is the kind of upgrade that delivers both peace of mind and serious durability. It’s designed for hard-working trucks that demand more than just a stock replacement. With a forged steel Callies crankshaft at the heart of it, this engine is built to handle the stress of towing, hauling, and everyday driving without flinching. It also comes loaded with quality hardware like ARP or OptiTorque head studs, and the internals are all brand-new, nothing reused or reconditioned where it counts. DFC doesn’t just patch things up, they machine everything to exact specs and address problem areas that often lead to failure in the LLY platform. That’s why they back it all with a 5-year, 160,000 km warranty. Whether you’re keeping a trusted work truck alive or getting your daily driver back on the road, this long block is made to last and made to perform.

Built With Precision And Reinforced From The Inside Out

This DFC SS6604505LLYSOALBCC Street Series Long Block is a fully remanufactured powerplant that goes far beyond the basics of a stock rebuild. Designed for the 6.6L Duramax LLY platform used in 2004.5-2005 HD trucks, it includes a forged Callies crankshaft known for its superior strength and balance under load. The block is professionally bored to accept the next oversize piston, and every internal component is either new or upgraded, right down to the Total Seal gapless piston rings that improve combustion efficiency and reduce oil loss. Cylinder heads are fully rebuilt with new seats, guides, valves, and stem seals, then resurfaced and magnafluxed for durability and reliability. The woodruff keyed camshaft and EDM doweled oil pump gear further improve longevity by reinforcing key stress points. All machining is done using high-precision Rottler equipment, ensuring consistent tolerances across every surface. With rockers and pushrods pre-set to factory spec and a complete top-end gasket kit included, this long block is ready to support serious work without compromise.

Fits: 2004.5, 2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY

Notes:

• Engine is built for 2004.5-2005 GM/Chevy 2500HD and 3500HD trucks with 6.6L Duramax LLY
• Street Series is best suited for daily drivers, diesel enthusiasts, and general-purpose work trucks
• Equipped with a forged Callies crankshaft for enhanced durability
• Remanufactured using all-new internal components that meet or exceed OEM standards
• Includes short block, rebuilt cylinder head, and full top-end gasket kit
• Head studs may be ARP Series 2000 or OptiTorque depending on supply
• Cylinder heads are resurfaced, magnafluxed, and rebuilt with new internals
• Block is machined and bored to accept next oversize pistons
• Designed to correct known failure points in the factory LLY engine
• Covered by DFC's 5-year or 160,000 km (100,000 mile) limited warranty
• This is a long block only, accessories, fuel components, and electronics not included
• Professional installation is recommended to ensure proper fit and performance

Street Series vs Tow/Haul vs Tow/Haul HD

• Street Series: Ideal for daily driving, light work, and diesel enthusiasts. Focuses on reliability upgrades over stock, with head stud and sealing improvements.

• Tow/Haul Series: All Street upgrades plus added performance parts for higher load and towing power. Supports builds up to ~700 HP.

• Tow/Haul HD Series: The most robust option. Adds heavy-duty internals like Wagler rods and a balanced rotating assembly for 800+ HP capability.

Standard/Auto vs Standard vs Auto

• Standard/Auto: Compatible with both manual and automatic transmissions. Offers the most flexibility.

• Standard: Built specifically for manual transmission configurations.

• Auto: Built specifically for automatic transmission setups.