DFC Diesel SS671920CP4SOALB Street Series Speed of Air Long Block (STD/Auto) | 2019-2020 Dodge RAM 2500/3500 6.7L Cummins (CP4)

Features:

• Speed of Air Hyperformance pistons included
• CNC-machined turbulator dimples on piston tops
• Total Seal gapless piston rings standard
• Retro build uses 2018-era block components
• Flat tappet valvetrain replaces roller lifters
• ARP Series 2000 or OptiTorque head studs
• Machined on advanced Rottler equipment
• Improved gasket sealing in common leak areas
• All new pistons, rings, bearings, valves, and seals
• Upgradable to an O-ringed cylinder head
• 5 year, 100,000 mile warranty

Proven 2018 Era Components Meet Speed Of Air Pistons In A Fresh 6.7L

If your 2019 or 2020 RAM 2500 or 3500 has lost its Cummins, you are probably wondering whether the replacement will have the same weak points as the engine that failed. DFC built its Street Series to answer that, and the company calls it its flagship line for work trucks, daily drivers, and diesel enthusiasts. This Speed of Air version uses what DFC calls a retro block, which means 2018 era components on the block along with a flat tappet valvetrain in place of the roller lifters. DFC says it takes that approach to address camshaft and lifter failures and the lighter blocks it points to on newer trucks. On top of that, you get Speed of Air Hyperformance pistons, with CNC machined dimples called turbulators that DFC and Speed of Air say help the flame burn closer to the cool chamber walls and improve combustion efficiency. They say that can mean better fuel mileage and more power and pulling power, though results will vary by truck and how it is driven. Total Seal gapless rings, improved gasket sealing in the common leak areas, and a 5 year, 100,000 mile warranty round out the package. For a CP4 truck that you plan to keep working, this is a rebuild with a lot of thought behind it.

Retro Block Hardware And Turbulator Pistons Explained Piece By Piece

The DFC Diesel SS671920CP4SOALB is a remanufactured Street Series Speed of Air long block for 2019-2020 Dodge RAM 2500 and 3500 trucks with the 6.7L Cummins in the CP4 configuration, listed for standard and automatic transmission applications. It follows DFC's retro block approach, which the company describes as using 2018 era components on the block, replacing roller lifters with a more durable flat tappet system, and installing stronger parts such as the cam, valve springs, and heads. DFC also uses silicone sealing in place of paper gaskets for better reliability. The Speed of Air Hyperformance pistons use patented turbulator indentations CNC machined into the piston top to exacting tolerances under ISO 9001 quality standards. The pistons carry a thermal barrier coating on the crowns and an anti friction coating on the skirts. Every engine comes standard with Total Seal gapless piston rings and improved gasket sealing methods in common leak areas, along with all new pistons, rings, bearings, gaskets, seals, valves, springs, hardened seats, stem seals, and cast guides. The engine is machined on Rottler equipment, comes assembled with ARP Series 2000 or OptiTorque head studs depending on availability, and can be upgraded to an O-ringed cylinder head. DFC backs it with a 5 year, 160,000 km (100,000 mile) warranty.

Fitment: 2019, 2020 Dodge RAM 2500/3500 6.7L Cummins (CP4)

Notes:

• Built on a retro block with 2018 era components and a flat tappet valvetrain
• Listed for the CP4 configuration, confirm your injection pump setup before ordering
• Built with Speed of Air Hyperformance pistons
• Fuel mileage, power, and torque gains are manufacturer claims, results will vary
• Head studs are ARP Series 2000 or OptiTorque, depending on availability
• Upgradable to an O-ringed cylinder head
• Component brands are chosen by DFC and cannot be specially requested
• Warranty listed as 5 years or 160,000 km (100,000 miles)
  
• $500 shipping charge/$2,800 core charge
• California shipping restriction for this SKU
• California Proposition 65 warning applies to this product