DFC Diesel TH6003AUSOALBHD Tow/Haul HD Series Auto Speed Of Air Long Block | 2003 Ford F250/F350 6.0L Powerstroke

Features:

• Built for up to 900 horsepower
• Rated for 500–750 HP towing loads
• Includes Wagler or Carrillo rods
• Heavy-duty flexplate for added strength
• Balanced rotating assembly reduces vibration
• New OEM balancer for smooth operation
• ARP or OptiTorque head studs included
• New OEM or equivalent pistons and rings
• Remanufactured heads with all-new components
• Machined and bored for oversized pistons
• Complete top-end gasket kit included
• Backed by 5-year, 160,000km warranty

Push Your Powerstroke Past The Limit Without Breaking A Sweat

If you’re ready to take your 2003 F250 or F350 6.0L Powerstroke to the next level, the DFC Tow/Haul HD Series Long Block delivers the kind of strength and reliability that serious truck owners count on. Built for those who tow heavy loads regularly but also want room to grow into high horsepower builds, this engine is rated to handle up to 900 horsepower at the crank. Whether you’re hauling a fifth wheel, a loaded trailer, or just want peace of mind for long-distance pulls, this build is engineered to take the stress without breaking down. It’s equipped with premium internal components like Wagler or Carrillo rods and a heavy-duty flexplate, giving you confidence when you push your truck harder than stock was ever meant to handle. A new OEM balancer and a fully balanced rotating assembly help keep your ride running smooth under strain, even during extended high-load use. And with a full 5-year, 160,000 kilometer warranty, you’re not just getting a powerful setup, you’re getting support that sticks. It’s everything you need when dependability, torque, and pulling power are part of your daily routine.

A No Compromise Build That Knows Its Purpose

Every detail of the DFC Diesel TH6003AUSOALBHD Tow/Haul HD Long Block has been carefully spec’d for high-demand applications and long-term performance. This engine begins with a remanufactured block that’s been machined and bored to accept oversized pistons for tighter tolerances and more reliable combustion. Internally, it’s loaded with name-brand components that meet or exceed OEM standards, including all-new pistons, rings, gaskets, and cylinder heads rebuilt with new valves, guides, and seals. The build includes ARP or OptiTorque head studs for superior clamping force, along with ARP rod bolts to lock things down where it counts. A complete top-end gasket kit is included to finish the install cleanly, along with all rockers and pushrods pre-installed for convenience. Unique to the HD Series, this long block adds forged connecting rods from either Wagler or Carrillo, both trusted names in diesel performance. When combined with the HD flexplate, OEM balancer, and balanced rotating assembly, the result is an engine that’s ready for daily street use while still having the bones to support high-performance upgrades in the future.

Fits: 2003 Ford F250/F350 6.0L Powerstroke

Notes:

• Engine is built for street and heavy towing use
• Supports up to 900 horsepower at the flywheel
• Ideal for trucks towing between 500 and 750 HP
• Includes either Wagler or Carrillo rods based on availability
• Comes with ARP 2000 or OptiTorque head studs
• Uses all new OEM or equivalent internal components
• Engine block is bored and machined for oversized pistons
• Remanufactured cylinder heads include new valves, guides, and seals
• 5-year or 160,000 kilometer manufacturer-backed warranty
• Includes a full top-end gasket kit for final assembly
• Rotating assembly is fully balanced for smoother operation
• Part compatibility specific to 2003 Ford F250 and F350 6.0L Powerstroke

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.