The Cummins ISB 6.7 engine delivers proven performance, durability, and efficiency for medium-duty trucks. Fleets across North America rely on the Cummins ISB 6.7 diesel engine to power Freightliner M2, box trucks, dump trucks, and vocational vehicles.
You get a balance of strong torque, long engine life, and easy serviceability, making the Cummins ISB 6.7 one of the most in-demand diesel engines on the market.
Cummins ISB 6.7 Engine Specs
- Engine Type: Inline 6-cylinder turbo diesel
- Displacement: 6.7L (409 cubic inches)
- Fuel System: High-pressure common rail
- Turbocharger: Variable Geometry Turbo (VGT)
- Horsepower: 200 – 360 HP
- Torque: 520 – 800 lb-ft
- Max RPM: ~2,600 RPM
- Emissions System: EGR + DPF
- Configuration: Cast iron block and head
👉 These Cummins ISB 6.7 specs deliver reliable power for daily commercial use.
Why the Cummins ISB 6.7 Engine Dominates Medium-Duty Trucks
The Cummins ISB 6.7 engine stands out because it combines power, efficiency, and reliability in one platform.
✔ Built for Work
You can run this engine in:
- Freightliner M2 trucks
- Box trucks
- Dump trucks
- Utility trucks
- Delivery fleets
✔ Strong Low-End Torque
The Cummins 6.7 diesel engine produces high torque at low RPM, which helps with:
- Stop-and-go driving
- Heavy loads
- Urban delivery routes
✔ Proven Reliability
Cummins designed the ISB 6.7 with:
- A robust inline-6 platform
- Heavy-duty internal components
- Long service intervals
Cummins ISB 6.7 Engine Features
High-Pressure Common Rail Fuel System
The system delivers precise fuel injection, which improves:
- Fuel efficiency
- Engine response
- Overall performance
Variable Geometry Turbocharger (VGT)
The VGT turbo boosts performance across all RPM ranges and improves engine braking.
Heavy-Duty Engine Design
You get:
- Cast iron block and head
- Gear-driven components
- Long-term durability under load
Cummins ISB 6.7 Evolution (Medium-Duty Trucks)
2007–2010: Introduction of the 6.7 Platform
Cummins launched the ISB 6.7 engine to replace the 5.9L platform. The new engine added:
- Larger displacement (6.7L)
- Variable geometry turbo
- Updated emissions systems
2010–2013: Performance Improvements
Cummins improved:
- Fuel economy
- Power ratings
- Engine calibration for fleets
2013–2018: Peak Medium-Duty Adoption
The Cummins ISB 6.7 became standard in trucks like the Freightliner M2. You see:
- Higher torque outputs
- Better reliability
- Optimized uptime
2018+ (B6.7 Platform)
Cummins updated the ISB into the B6.7, keeping the same core design while improving:
- Electronics
- Efficiency
- Emissions performance
Common Cummins ISB 6.7 Horsepower Ratings
| Application | Horsepower | Torque |
|---|---|---|
| Light Duty Vocational | 200–240 HP | 520–560 lb-ft |
| Medium Duty Trucks | 260–300 HP | 600–660 lb-ft |
| High Output | 300–360 HP | 700–800 lb-ft |
👉 Exact specs depend on CPL and configuration.
Why Buy a Cummins ISB 6.7 Engine
- ✔ High demand in the used engine market
- ✔ Easy to service and maintain
- ✔ Strong parts availability
- ✔ Long engine lifespan
- ✔ Excellent for commercial truck applications
If you need a reliable diesel engine for your truck, the Cummins ISB 6.7 engine gives you proven performance and long-term value.
Cummins ISB 6.7 Engine for Sale
We offer a wide selection of:
- Used Cummins ISB 6.7 engines
- Rebuilt Cummins 6.7 diesel engines
- Low-mileage take-out engines
👉 Browse our inventory below to find the right Cummins ISB 6.7 engine for your truck.
