DFC Diesel SS660104LB7SOALBCC Street Series Speed Of Air Long Block Callies Crankshaft (Standard/Auto) | 2001-2004 GM/Chevrolet 2500HD/3500HD 6.6L Duramax LB7

Features:

• Includes upgraded Callies forged steel crankshaft
• Fits 2001–2004 6.6L Duramax LB7 trucks
• Ideal for daily drivers and light towing
• Backed by 5-year, 160,000 km warranty
• Remanufactured to exceed OEM specifications
• Total Seal gapless piston rings standard
• All new pistons, rings, bearings, and gaskets
• ARP or OptiTorque head studs included
• Block bored for next oversized pistons
• Professionally machined using Rottler equipment
• Complete top-end gasket kit included
• Reman heads with new valves and seals

Built Tough To Push Past Factory Limits

If you’re rebuilding your 2001–2004 Duramax 2500HD or 3500HD and want more than a stock replacement, the DFC Street Series Long Block with a Callies crankshaft gives you exactly that. This isn't just a reman, it’s an upgrade built for truck owners who expect more from their engine day in and day out. Whether you're towing gear, running job sites, or just putting serious miles on the road, this long block is engineered to outlast and outperform typical rebuilds. The addition of the Callies forged crank gives it a massive edge in strength and reliability, especially under load. Backed by a 5-year, 160,000 km warranty, it’s built with premium components throughout, including all new pistons, rings, and bearings that meet or exceed OEM specs. ARP or OptiTorque head studs help it hold up under pressure, giving you confidence where other engines tend to fail. This is the kind of long block you drop in when you want a dependable workhorse that doesn’t just survive, it thrives.

Engineered With Proven Strength Where It Counts

At the center of the DFC SS660104LB7SOALBCC Street Series long block is a forged steel Callies crankshaft, known across the industry for delivering unmatched durability in high-stress diesel builds. The engine block is professionally machined using Rottler equipment, then bored to accept next oversized pistons for improved fit and oil control. Total Seal gapless piston rings are used to maximize combustion efficiency and reduce blow-by, while each head is magnafluxed, resurfaced, and rebuilt with brand new valves, guides, and stem seals. The short block is paired with a complete top-end gasket kit and includes rockers and pushrods pre-set to factory specs for a smoother install. DFC also includes their EDM doweled oil pump gear and woodruff-keyed camshaft for added mechanical reliability and long-term stability. This engine is built to tighter tolerances than most off-the-shelf replacements, ensuring it can take on both stock and moderately tuned applications with ease. From its component quality to machining precision, every part of this build reflects DFC’s focus on long-term performance and daily usability.

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

Notes:

• Designed for 2001–2004 GM/Chevrolet 2500HD and 3500HD with 6.6L LB7 Duramax
• Street Series is built for daily drivers and work trucks
• Includes upgraded Callies forged steel crankshaft for added strength
• Remanufactured using all new OEM or equivalent internal components
• Block is professionally machined and bored for oversized pistons
• Cylinder heads are resurfaced, magnafluxed, and fully rebuilt
• Includes ARP or OptiTorque head studs depending on availability
• Top-end gasket kit and pre-set valvetrain included
• Machined using high-precision Rottler equipment for consistent tolerances
• Covered by a 5-year or 160,000 km limited warranty
• Engine is not a complete drop-in unit, final assembly required
• Professional installation and proper break-in process 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.