DFC Diesel SS6607510LMMSOALB Street Series Speed Of Air Long Block (Standard/Auto) | 2007.5-2010 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LMM

Features:

• 5-year, 160,000 km warranty coverage
• Built for 2007.5–2010 Duramax LMM trucks
• Includes complete short block and cylinder heads
• All-new pistons, rings, and bearings
• High-performance Total Seal gapless piston rings
• ARP or OptiTorque head studs included
• Woodruff keyed camshaft for better durability
• EDM doweled oil pump gear improves reliability
• New valves, springs, and stem seals installed
• Machined using advanced Rottler equipment
• Upgraded sealing in common leak areas
• Designed for daily drivers and work trucks

Take Your Duramax From Stock To Solid

If your 2007.5 to 2010 Duramax-powered 2500HD or 3500HD has seen better days, the DFC Diesel Street Series Long Block is your go-to solution to bring it back stronger than ever. Built for diesel drivers who expect more than factory performance, this remanufactured engine is all about delivering reliability you can count on, whether you're hauling gear to the jobsite or running weekend errands with a trailer in tow. The Street Series isn’t just a basic rebuild, it's loaded with upgrades in all the right places. You'll get ARP or OptiTorque head studs for improved clamping strength, plus Total Seal gapless piston rings that hold compression better than stock. That means more efficient combustion, less blow-by, and a tighter, cleaner-running engine overall. Even the oil pump gear has been upgraded with DFC’s custom EDM doweling for better long-term reliability under high-load conditions. And with a 5-year, 160,000-kilometer warranty that backs it all, this engine is clearly built to last. It’s the kind of peace of mind you want under the hood when your truck has a job to do.

Precision Remanufacturing That Exceeds Factory Expectations

Every component in the DFC Diesel SS6607510LMMSOALB Street Series Long Block is carefully remanufactured to meet and exceed original OEM specs. The block is professionally machined and bored to accept next oversized pistons, which are brand new along with the rings, bearings, and gaskets. Cylinder heads are resurfaced, magnafluxed for cracks, and fully rebuilt with new seats, guides, valves, and stem seals to ensure optimal airflow and combustion. This engine also features DFC’s upgraded sealing process in common leak-prone areas, improving long-term durability. The camshaft is secured with a Woodruff key for better timing retention, while high-tensile head studs help maintain proper sealing under higher cylinder pressures. Everything from the rockers to the pushrods is preset to factory spec, making installation easier and more streamlined. From the advanced Rottler machining equipment to the name-brand internals, this engine is built with top-tier components that work together to extend service life and enhance overall performance.

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

Notes:

• Built for 2007.5–2010 GM/Chevy 2500HD and 3500HD with 6.6L Duramax LMM
• Designed as a direct long block replacement for trucks with standard or automatic transmissions
• Intended for daily drivers, work trucks, and diesel enthusiasts
• Includes short block, cylinder heads, and full top-end gasket kit
• Does not include fuel system, turbo, or electronics
• Core return is typically required by the manufacturer
• ARP or OptiTorque head studs included based on current availability
• All internal components are new or reconditioned to exceed OEM standards
• Engine is pre-set to factory specs for easier installation
• Warranty covers 5 years or 160,000 kilometers (100,000 miles)
• Ideal for customers looking to upgrade known weak points in the factory engine
• Professional installation is recommended for proper performance and warranty validation

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.