DFC Diesel SS660104LB7TKSOALBCC Street Series Speed Of Air Long Block Callies Crankshaft (Standard/Auto) | 2001-2004 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LB7 TOPKICK

Features:

• Fits 2001–2004 TopKick 6.6L LB7 engines
• Includes Callies forged steel crankshaft upgrade
• Backed by 5-year, 160,000 km warranty
• Built for work trucks and daily driving
• All new OEM or equivalent internal parts
• Block bored for next oversized pistons
• Total Seal gapless piston rings included
• Reman heads with new valves and guides
• ARP or OptiTorque head studs installed
• Top-end gasket kit included with long block
• Woodruff keyed camshaft for added stability
• Machined using advanced Rottler equipment

When Stock Reliability Is Not Enough Anymore

If your 2001–2004 TopKick is due for a serious engine upgrade, the DFC Street Series Long Block with a Callies crankshaft is built for truck owners who demand more than just a standard replacement. This isn’t some average reman pulled from a shelf, it’s purpose-built for work-ready trucks, diesel daily drivers, and guys who want peace of mind under the hood. DFC backs this long block with a 5-year, 160,000 km warranty, giving you real confidence when it matters most. At the heart of the build is a forged steel Callies crankshaft, a major strength upgrade that gives this engine the edge in durability and rotating stability. Whether you’re hauling heavy loads or logging long hours on the road, this engine is designed to take the punishment and keep going. Everything inside is brand new, including OEM-grade pistons, rings, and gaskets, which means you’re not inheriting the problems of an old core. It also ships with a top-end gasket kit and pre-set valvetrain, making installation smoother and less time-consuming for whoever’s turning the wrenches.

Engineered To Handle More Than Daily Duty

The DFC SS660104LB7TKSOALBCC Street Series long block is built with attention to detail and high-performance internals to support your 2001–2004 TopKick’s demanding workload. One of the key upgrades in this build is the Callies forged crankshaft, which offers superior strength over the factory unit and is ideal for higher torque conditions. The block is precision-machined using Rottler equipment and bored to accept next oversized pistons, improving both fit and oil control. Inside the cylinders, Total Seal gapless rings work to reduce blow-by and improve combustion efficiency. Each remanufactured cylinder head is fully resurfaced, magnafluxed, and fitted with all new valves, guides, and stem seals to restore proper airflow and sealing. Supporting components like the EDM doweled oil pump gear and woodruff keyed camshaft are installed to enhance long-term durability. ARP or OptiTorque head studs are included depending on availability, ensuring solid head retention even under load. This long block is built not just for stock reliability, but for the kind of work real trucks face every day.

Fits: 2001, 2002, 2003, 2004 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LB7

Notes:

• Designed specifically for 2001–2004 GMC TopKick with 6.6L Duramax LB7
• Street Series is ideal for daily use and light to moderate towing
• Includes Callies forged steel crankshaft for added strength and longevity
• Remanufactured using all new OEM or equivalent internal components
• Block is bored to fit next oversized pistons for better fitment
• Cylinder heads are fully rebuilt with new valves, guides, and seals
• Heads are resurfaced and magnafluxed for reliability and sealing
• Includes ARP or OptiTorque head studs depending on availability
• Top-end gasket kit and pre-set valvetrain included with engine
• Machined using high-precision Rottler equipment for consistent tolerances
• Covered by a 5-year or 160,000 km limited warranty
• Professional installation and proper engine break-in strongly recommended

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.