DFC Diesel SS6604505LLYTKSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2004.5-2005 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LLY TOPKICK

Features:

• Fits 2004.5-2005 LLY TopKick applications
• Includes forged Callies crankshaft for strength
• Backed by 5-year, 160,000 km warranty
• Ideal for daily use and moderate towing
• Remanufactured to meet or exceed OEM specs
• All-new pistons, rings, gaskets, and bearings
• Fully rebuilt and resurfaced cylinder heads
• Comes with ARP or OptiTorque head studs
• Advanced Rottler machining for tight tolerances
• Includes Total Seal gapless piston rings
• Woodruff keyed camshaft improves durability
• Top-end gasket kit included for installation

Upgrade Your TopKick With Power You Can Trust

If your 2004.5-2005 TopKick is starting to feel worn down or you’re looking to build a more dependable workhorse, this DFC Street Series Long Block is the perfect foundation. It’s built for drivers who count on their trucks day in and day out and want an engine that can hold up without question. One of the biggest highlights here is the forged Callies crankshaft, which brings serious strength and long-term reliability to your bottom end. Add to that a full list of upgraded internals and high-quality machine work, and you're looking at a long block that’s made to last. Whether you're hauling loads across town or running your truck as a daily driver, this engine is built to outperform the stock LLY in all the ways that matter. It also comes with a 5-year, 160,000 km warranty, so you can stop worrying and focus on putting your truck to work. It’s more than a replacement, it’s a serious step up from factory performance.

Precision Built For Demanding Duramax LLY Applications

The DFC SS6604505LLYTKSOALBCC Street Series Long Block is built with exacting standards and premium-grade components designed for the 6.6L Duramax LLY platform in 2004.5-2005 TopKick models. At the center of this build is a forged Callies crankshaft, known for its excellent balance and durability under load. The block itself is machined to accept the next oversize pistons, with all-new internals including rings, bearings, seals, and gaskets that meet or exceed OEM specifications. The cylinder heads are fully remanufactured with new guides, seats, valves, and stem seals, then resurfaced and magnafluxed to ensure strength and sealing integrity. ARP or OptiTorque head studs are used to clamp everything together, depending on availability, while Total Seal gapless rings are installed to improve combustion and reduce oil loss. The woodruff keyed camshaft and EDM doweled oil pump gear are thoughtful touches that help eliminate known weak points in factory builds. This long block also arrives with pre-set rockers and pushrods and a complete top-end gasket kit to make installation more straightforward and efficient.

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

Notes:

• Engine is designed specifically for 2004.5-2005 GM/Chevy TopKick models with the 6.6L Duramax LLY
• Street Series is ideal for daily use, diesel enthusiasts, and general work applications
• Features a forged Callies crankshaft for increased bottom-end strength
• All internal components are new or meet OEM or better standards
• Includes fully remanufactured cylinder heads with all new seats, valves, guides, and stem seals
• Block is bored to accept next oversize pistons for proper fitment
• Uses ARP or OptiTorque head studs depending on supply availability
• Machined using advanced Rottler equipment to ensure precision tolerances
• Not a complete engine, external accessories, turbo, ECM, and fuel system components not included
• Includes a complete top-end gasket kit for installation
• Comes with DFC's industry-leading 5-year or 160,000 km limited warranty
• Professional installation is recommended to ensure proper function and warranty compliance

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.