DFC Diesel SS660607LBZTKSOALBCC Street Series Speed Of Air Long Block - Callies Crankshaft (Standard/Auto) | 2006-2007 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LBZ TOPKICK

Features: - 5-year / 160,000 km warranty coverage - Equipped with Callies forged steel crankshaft - Total Seal gapless piston rings included - ARP or OptiTorque head studs installed - EDM doweled oil pump gear for strength - Woodruff keyed camshaft for secure timing - Precision machining with advanced Rottler equipment - Improved gasket sealing in leak-prone areas - All new pistons, rings, and bearings - New gaskets, seals, and valve components - Cylinder heads resurfaced and magnafluxed - Complete top-end gasket kit included Built To Keep Your Duramax Working Hard If you are looking to get your 2006-2007 GM or Chevrolet 2500HD, 3500HD, or TopKick back on the road with an engine that is tougher than stock, the DFC Diesel Street Series Long Block is a strong choice. This build features a Callies forged steel crankshaft, giving it the kind of bottom-end strength you want for towing, hauling, and long-term reliability. It is engineered for owners who push their trucks every day, whether that means pulling a trailer across provinces or hauling heavy loads for work. You also get proven upgrades like ARP or OptiTorque head studs, Total Seal gapless piston rings, and a custom EDM doweled oil pump gear for added peace of mind. DFC backs it with an industry-leading 5-year or 160,000 km warranty, so you can run it with confidence. Every major component is brand new and built to meet or exceed OEM specifications, making it an investment that delivers both performance and durability. Once installed, you will have an engine ready to take on whatever the road or job site throws at it. Precision Engineered From Crankshaft To Cylinder Head The DFC Diesel SS660607LBZTKSOALBCC Street Series Long Block starts with a remanufactured block that has been professionally machined and bored to fit next over-sized pistons. At its core sits a Callies forged steel crankshaft, chosen for its exceptional strength and ability to withstand high stress over time. All new pistons, rings, bearings, and gaskets are installed, using OEM or equivalent components to ensure consistent quality and performance. Cylinder heads are fully remanufactured with new seats, guides, valves, and stem seals, then resurfaced and magnafluxed to verify strength and prevent future issues. Rockers and pushrods are preset to exact factory specifications, helping the engine run smoothly right from the first start. Advanced Rottler machining technology is used throughout the process to achieve precise tolerances. The build is finished with improved gasket sealing in known leak-prone areas, along with a complete top-end gasket kit for a clean, straightforward installation. Fits: 2006, 2007 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LBZ Topkick Notes: - Designed for 2006-2007 GM/Chevrolet 2500HD, 3500HD, and TopKick with 6.6L Duramax LBZ - Street Series is DFC’s flagship engine build for strength and reliability - Equipped with a Callies forged steel crankshaft for added durability - Engine is a remanufactured long block, not a complete drop-in - Includes upgrades to address common factory problem areas - Professionally machined and bored for next over-sized pistons - Built with all new OEM or equivalent internal components - Cylinder heads are fully re-manufactured, resurfaced, and magnafluxed - Rockers and pushrods are preset to exact factory specifications - Comes with complete top-end gasket kit for installation - Covered by a 5-year / 160,000 km manufacturer warranty 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.