DFC Diesel SS6607510LMMSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2007.5-2010 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LMM

Features:

• Includes premium Callies forged crankshaft
• Fits 2007.5–2010 Duramax LMM applications
• Compatible with 2500HD and 3500HD trucks
• Backed by 5-year, 160,000 km warranty
• All-new pistons, rings, and bearings installed
• Total Seal gapless rings for better compression
• ARP or OptiTorque head studs included
• Professionally machined for oversized pistons
• Woodruff keyed camshaft for added strength
• Includes full top-end gasket kit
• Remanufactured heads with new valves and guides
• Built for daily driving and light towing

Build Your Truck Around A Bulletproof Foundation

If your Duramax is starting to feel tired, this Street Series Long Block with a Callies crankshaft is the upgrade your 2007.5 to 2010 2500HD or 3500HD needs. Whether you’re hauling, commuting, or just want something you can depend on, this engine is built to take a beating and keep going. At the heart of it is the Callies forged crankshaft, a serious upgrade over stock that brings next-level strength and rotational stability. That alone makes it a smart investment for anyone looking to get more life and reliability out of their build. Add in ARP or OptiTorque head studs, Total Seal gapless piston rings, and DFC’s upgraded oil pump gear, and you’re looking at a long block that’s been engineered from top to bottom with longevity in mind. It's built for drivers who want their truck to feel tight, strong, and dependable, without cutting corners or settling for stock replacements. Backed by a 5-year, 160,000-kilometer warranty, this is the kind of engine you put in once and drive with confidence for years.

Strength Starts With Premium Internals And Tight Tolerances

This DFC Diesel Street Series Long Block is a professionally remanufactured 6.6L Duramax built to outperform stock at every level. It’s been machined to exacting standards using industry-leading Rottler equipment, and bored to accept next oversized pistons for tighter sealing and longer life. The forged Callies crankshaft gives the rotating assembly unmatched durability, making it ideal for trucks under constant load or daily stress. Every internal component is either brand new or reconditioned to exceed OEM expectations, including pistons, rings, bearings, valves, and stem seals. The cylinder heads are fully rebuilt with new guides and seats, then resurfaced and magnafluxed to ensure structural integrity before final assembly. DFC presets all valvetrain components to factory specs, so install is clean and consistent with less adjustment needed. With improved sealing in known leak-prone areas and upgrades in all the weak spots Duramax engines are known for, this long block is built to keep your truck running hard for the long haul.

Fits: 2007.5, 2008, 2009, 2010 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LMM

Notes:

• Engine is built for 2007.5–2010 6.6L Duramax LMM
• Fits GM 2500HD and 3500HD trucks with standard or automatic transmissions
• Includes upgraded Callies forged crankshaft for added durability
• Street Series is ideal for daily driving and light towing
• Engine is a long block configuration, not a full drop-in
• Fuel system, turbocharger, and electronics are not included
• All valvetrain components come pre-set to factory specifications
• Core return may be required as part of the purchase
• Professional installation is recommended for optimal performance and warranty validation
• Warranty covers 5 years or 160,000 kilometers with proper installation
• Designed to correct common factory engine failure points
• Upgraded components may vary based on availability

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.