Looking for a used 6.7 Cummins engine for sale? Look no further than the robust power and reliability of this renowned inline-six turbocharged diesel engine from Cummins Inc. Whether you're replacing a worn engine in your Ram 2500, 3500, 4500, or 5500 heavy-duty truck, completing a Freightliner Business Class M2 service rebuild, or sourcing a powerplant for a custom diesel swap project, the 6.7 Cummins is the heart of Dodge and Ram heavy-duty diesel pickup performance since mid-year 2007. Built to handle heavy loads, demanding work cycles, and the punishment of commercial duty cycles, this engine is a favorite among diesel truck enthusiasts, fleet managers, and contractors alike.
The 6.7L Cummins ISB turbo diesel engine is renowned for its power output, robust construction, and the legendary durability that has made Cummins B-series engines the choice of Dodge / Ram heavy-duty trucks for decades. Compatible with Dodge Ram 2500 and 3500 (2007.5 through current), Ram 4500 and 5500 chassis cab (2008 through current), and Freightliner Business Class M2 medium-duty trucks, these engines deliver impressive performance across multiple generations. With stock power outputs ranging from 350 horsepower / 610 lb-ft (early 2007.5 to 2010 base trucks) to 420 horsepower / 1,075 lb-ft (current High Output variants), a used 6.7 Cummins engine delivers serious heavy-duty diesel capability.
Before ordering, it's essential to understand which generation of the 6.7 Cummins you need. The engine has gone through four distinct generations with significant differences in fuel system, emissions equipment, power output, and reliability characteristics:
When ordering, match the generation to your truck. Installing a Generation 3 engine (CP4.2) into a Generation 1 truck (designed for CP3) requires fuel system modifications.
The Cummins ISB 6.7L is used in:
Despite some descriptions claiming compatibility with Freightliner Cascadia, Kenworth T680 / T880, and Peterbilt 567 / 579, the Cummins 6.7L ISB is a medium-duty engine. These Class 8 heavy-duty long-haul trucks typically use the larger Cummins ISX15 / X15 (15-liter) engine, not the 6.7L ISB. The 6.7 Cummins is appropriate for:
For Class 8 heavy-duty long-haul applications (Cascadia, T680, 579), you need the Cummins ISX15 / X15. Call (240) 301-0095 to inquire about ISX15 availability.
All our used 6.7 Cummins engines for sale are sold with their original factory emissions equipment intact and adhere to EPA regulations. We include the necessary emissions system components (DPF, EGR system, and where applicable SCR / DEF system for 2013 plus engines) to ensure your truck remains compliant with current standards when properly installed.
Opting for a used 6.7 Cummins engine offers several advantages over alternatives:
Whether you're replacing a worn engine in your daily-driven Ram 2500, restoring a contractor work truck, or building a high-performance Cummins-powered project, our selection of used 6.7 Cummins engines for sale has you covered. With options spanning all four generations and both Standard and High Output variants, you're sure to find the right engine for your truck.
Browse our inventory of 6.7 Cummins engines for sale now, or contact our team for personalized recommendations matching your specific year, body code, and trim. Experience the power and reliability of a Cummins diesel in your truck. Your journey to enhanced performance starts here!
| Vehicle | Compatibility |
|---|---|
| Dodge Ram 2500 / Ram 2500 (2007.5 to Current) | All generations of 6.7 Cummins Standard and HO variants |
| Dodge Ram 3500 / Ram 3500 (2007.5 to Current) | All generations of 6.7 Cummins Standard and HO variants |
| Ram 4500 Chassis Cab (2008 to Current) | Medium-duty work truck with 6.7 Cummins |
| Ram 5500 Chassis Cab (2008 to Current) | Medium-duty work truck with 6.7 Cummins |
| Freightliner Business Class M2 (Various Years) | Medium-duty commercial truck with 6.7 Cummins option |
| NOT Applicable: Class 8 Heavy-Duty Trucks (Cascadia, T680, 579) | These use larger ISX15 / X15, not 6.7L ISB |
| Generation Identification | Gen 1 (2007.5 to 2012, CP3, no DEF) │ Gen 2 (2013 to 2018, CP3, DEF added) │ Gen 3 (2019 to 2023, CP4.2) │ Gen 4 (2024 plus) |
| Aspiration | Turbocharged (Variable Geometry Turbocharger | VGT / Cummins Holset) |
|---|---|
| Bore X Stroke | 4.21 inches x 4.88 inches |
| Compression Ratio | 16:1 to 18:1 |
| Cooling System | Liquid cooled |
| Electrical System | 12 volt |
| Fuel System | High-Pressure Common Rail (HPCR) with Bosch CP3 (2007.5 to 2018) or Bosch CP4.2 (2019 to current) |
| Fuel Type | Ultra Low Sulfur Diesel (ULSD) |
| Valvetrain | Overhead Valve (OHV) pushrod | typically 4 valves per cylinder |
| Engine Type | Inline-six diesel |
| Manufacturer | Cummins Inc. (Columbus | Indiana | USA) |
| Model | ISB 6.7L (also B6.7 in current Cummins nomenclature) |
| Displacement | 6.7 liters (408 cubic inches) |
| Block Material | Cast Iron |
| Cylinder Head Material | Cast iron |
| Horsepower Range | 350 to 420+ HP (varies by generation and SO / HO variant) |
| Torque Range | 610 to 1 | 075 lb-ft (varies by generation and SO / HO variant) |
| Production Years | Mid-2007 (2007.5) to current production |
| Predecessor | Cummins ISB 5.9L 24-valve (1998.5 to 2007 Dodge Ram heavy-duty) |
| Compatibility | 2007.5 to current Dodge / Ram 2500 | 3500 | 4500 | 5500 plus Freightliner M2 |
I bought a used 6.7 Cummins engine from Vaz Auto Solutions for my Ram 2500. It arrived promptly and performs like new. Great power and reliability. Highly satisfied!
Purchased a used 6.7 Cummins engine from Vaz Auto Solutions for my Dodge Ram. Installation was straightforward, and the engine runs smoothly. It's a fantastic upgrade with excellent performance.
Contact (240) 301-0095 within 15 days.
