671920CP4SOASB Speed of Air Short Block (STD/AUTO)

Features:

• Speed of Air piston technology
• Improves combustion efficiency and responsiveness
• Potential fuel savings up to 25%
• Quicker turbo spool response
• Improves usable low end power
• Potentially extends oil change intervals
• Helps reduce NOx emissions
• ISO 9001 quality standards
• Includes all internal engine components
• Front and rear covers included
• Complete installation gasket kit included
• Fits 2019-2020 6.7L Cummins CP4

Get More From Every Mile And Every Pull

There is a lot to gain when an engine rebuild does more than simply return your Cummins to running condition. The DFC Diesel 671920CP4SOASB Speed of Air Short Block is built for 2019-2020 Ram 2500 and 3500 trucks equipped with the 6.7L Cummins and CP4 fuel system, giving owners a fresh foundation with efficiency focused technology inside. Speed of Air reports fuel economy improvements between 15% and 25%, which can make a meaningful difference for trucks that rack up highway miles or spend long days pulling a trailer. The technology is also designed to provide quicker turbo response and more usable low end power, helping the truck feel stronger and more responsive when accelerating with a load. Reduced soot and more efficient combustion can contribute to longer oil change intervals, fewer regeneration cycles, and lower DEF consumption, helping address operating costs beyond the initial rebuild. This short block also includes the front cover with seal, rear cover with main seal, oil pan, internal components, complete installation gasket kit, and important instructions. For a hardworking Cummins that needs a new beginning, this Speed of Air assembly combines the essentials of a short block replacement with technology designed to make everyday driving and heavy use more efficient.

Smarter Combustion Turns Fuel Into Useful Work

The performance advantages of the DFC Diesel 671920CP4SOASB begin inside the combustion chamber, where Speed of Air piston technology is engineered to improve how the air and fuel mixture burns. The piston design promotes a thinner boundary layer between the mixture and combustion surfaces, allowing more of the available fuel energy to contribute to the combustion process instead of being lost as waste. This increased combustion efficiency is what supports the reported improvements in fuel economy while also helping produce more usable low end power and quicker turbo spool. Cleaner combustion can reduce soot and visible exhaust, while Speed of Air reports NOx reductions ranging from 20% to 80% or more under tested conditions. The pistons are precision engineered under ISO 9001 quality standards, adding controlled manufacturing practices to a component that operates under substantial cylinder pressure and heat. Beyond the specialized piston technology, the assembly includes the internal short block components along with the oil pan and front and rear covers with their respective seals. Combined with the supplied installation gasket kit and manufacturer instructions, the package provides a comprehensive starting point for rebuilding a 2019-2020 CP4 equipped 6.7L Cummins.

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

Notes:

• Designed for 2019-2020 6.7L Cummins CP4 applications.
• Confirm CP4 fuel system compatibility before ordering.
• This is a short block assembly, not a complete engine.
• Configured for standard automatic transmission applications.
• Front cover with seal is included.
• Rear cover with main seal is included.
• Oil pan and internal components are included.
• Complete installation gasket kit is included.
• Important installation instructions are provided.
• Manufacturer performance claims are based on testing.
• Actual fuel economy improvements may vary.
• Listed shipping weight is 845 pounds.
• Core Charge: $2,900.