DFC Diesel TH6003STSOALBHD Tow/Haul HD Series Standard Speed Of Air Long Block | 2003 Ford F250/F350 6.0L Powerstroke

Features:

• Supports up to 900 flywheel horsepower
• Handles 500–750 HP towing demands
• Includes Wagler or Carrillo connecting rods
• Heavy-duty flexplate for added durability
• Balanced rotating assembly for smooth power
• New OEM balancer enhances engine stability
• ARP or OptiTorque head studs included
• Professionally machined and bored engine block
• All new OEM or equivalent internals
• Remanufactured heads with new components
• Complete top-end gasket kit included
• Backed by 5-year, 160,000km warranty

When Your Truck Needs Power That Lasts All Day

If you’re hauling serious weight or just want a 6.0L Powerstroke that won’t fold under pressure, the DFC Tow/Haul HD Series Standard Speed Long Block is built to take it. Designed for hard-working 2003 F250 and F350 trucks, this engine balances street reliability with the kind of towing strength that gives you confidence on steep grades or long hauls. It’s rated to handle up to 900 horsepower at the flywheel, so you’ve got plenty of room to upgrade as your build evolves. At the same time, it’s tuned to operate best in that 500 to 750 horsepower sweet spot where towing performance really shines. Whether you're pulling a fully loaded trailer or just want peace of mind every time you fire it up, this setup gives you a rock-solid foundation. With a new OEM balancer, heavy-duty flexplate, and balanced rotating assembly, it stays smooth even when the work gets rough. This engine isn't just about brute strength, it’s about delivering reliable, usable power where and when it matters most.

Every Critical Component Built With Precision In Mind

The DFC Diesel TH6003STSOALBHD Long Block is a fully remanufactured powerplant crafted with industry-leading quality and attention to detail. Each engine block is professionally machined and bored to accept oversized pistons, improving sealing and compression for a tighter, more consistent build. Internally, the setup includes all new OEM or equivalent pistons, rings, and gaskets, along with ARP 2000 or OptiTorque head studs and ARP rod bolts to ensure dependable strength where it matters. The cylinder heads are fully remanufactured with new seats, guides, valves, and seals, and are resurfaced and magnafluxed for total reliability. This long block includes a full top-end gasket kit and comes pre-assembled with rockers and pushrods already installed, making installation cleaner and faster. Unique to the HD Series, this build adds either Wagler or Carrillo forged rods depending on availability, giving you the internal strength to support higher horsepower goals without sacrificing longevity. When paired with the HD flexplate and balanced rotating assembly, this engine delivers the durability and refinement needed for daily use, heavy towing, or performance-driven builds.

Fits: 2003 Ford F250/F350 6.0L Powerstroke

Notes:

• Designed for 2003 Ford F250 and F350 6.0L Powerstroke
• Best suited for towing applications between 500 and 750 HP
• Capable of supporting builds up to 900 HP at the flywheel
• Includes all upgrades from Street and Tow/Haul Series
• Comes with either Wagler or Carrillo rods based on availability
• Engine includes ARP or OptiTorque head studs depending on supply
• Remanufactured using all new OEM or equivalent internal components
• Includes complete top-end gasket kit for installation
• Block is bored for oversized pistons to enhance performance
• Rotating assembly is professionally balanced for smooth operation
• Covered by a 5-year or 160,000 kilometer manufacturer warranty
• Long block ships with rockers and pushrods pre-installed

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.