DFC Diesel TH6004AUSOALBHD Tow/Haul HD Series Auto Speed Of Air Long Block | 2004 Ford F250/F350 6.0L Powerstroke

Features:

• Built for up to 900 horsepower
• Balanced rotating assembly included
• Wagler or Carrillo rods installed
• HD flexplate for added strength
• New OEM balancer included
• Designed for towing up to 750 HP
• Includes all Street and Tow Series upgrades
• ARP 2000 or OptiTorque head studs
• ARP connecting rod bolts pre-installed
• Complete gasket kit included
• Remanufactured to exceed OEM standards
• 5-year, 160,000km limited warranty

Push The Limits Without Sacrificing Daily Dependability

If you're looking for a diesel engine that can take on big horsepower without giving up street manners, the DFC Diesel TH6004AUSOALBHD Tow/Haul HD Series Long Block is built to deliver. This heavy-duty 6.0L Powerstroke build is rated for up to 900 HP at the flywheel, yet it’s designed to run reliably between the 500 to 750 HP range during daily use. Whether you’re towing a fifth wheel, hauling heavy equipment, or just looking to unleash serious power on demand, this long block brings the muscle without compromising drivability. It’s loaded with top-tier parts like a balanced rotating assembly, a brand-new OEM balancer, and an HD flexplate that adds strength where it counts. The heavy-duty internals make it perfect for trucks that pull hard, but still hit the street every day. You’ll also have peace of mind knowing this engine comes backed by a 5-year, 160,000km warranty, proving that DFC stands behind their craftsmanship. For any 2004 F250 or F350 owner who refuses to settle for average, this engine gives you all the performance without the trade-offs.

Reinforced From The Inside Out For Real Work

The Tow/Haul HD Series is DFC’s most advanced 6.0L long block, engineered for serious towing and high-output performance. Every build includes all the upgrades from both the Street and standard Tow/Haul Series, plus a host of heavy-duty enhancements meant to handle sustained power under load. It features a fully balanced rotating assembly, ensuring smoother operation and longer life under high-stress conditions. Internally, you’ll find either Wagler or Carrillo forged connecting rods, paired with ARP rod bolts and your choice of ARP 2000 or OptiTorque head studs depending on availability. These parts are proven to hold up under the kind of pressure found in high-horsepower builds. The block itself is professionally machined, bored to match oversized pistons, and assembled using new OEM or equivalent parts that exceed factory specs. A full top-end gasket kit, pre-installed rockers, pushrods, and HD-grade components make installation straightforward for qualified shops. If your 2004 F250 or F350 needs a powerplant that’s ready for serious abuse without cutting corners, this long block brings that and more to the table.

Fits: 2004 Ford F250/F350 6.0L Powerstroke

Notes:

• Rated for up to 900 HP at the flywheel
• Recommended power range for towing is 500 to 750 HP
• Includes all upgrades from Street and Tow/Haul Series
• Wagler or Carrillo rods used depending on availability
• Engine is remanufactured using brand new OEM or equivalent parts
• Block is machined and bored for oversized pistons
• Includes remanufactured cylinder heads with all new components
• Balanced rotating assembly supports smoother, longer-lasting performance
• Comes with a 5-year, 160,000km manufacturer-backed warranty
• Professional installation strongly recommended for proper setup
• Compatible with 2004 Ford F250 and F350 6.0L Powerstroke
• Built for street-driven trucks that also handle heavy-duty work

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.