Remanufactured Cummins ISB 6.7L (408 ci) Engine For Sale
1998–present — 200–325 hp (medium-duty) / 370–420 hp (Ram pickup) | 520–750 lb-ft (medium-duty) / 850–1,075 lb-ft (Ram pickup)
The Cummins ISB is one of the most versatile diesel engines ever produced, powering everything from Ram pickup trucks to medium-duty commercial vehicles and school buses. The ISB lineage traces back t...
Starting from $5,500 – $9,000 — 1-Year Unlimited Mileage Warranty
Cummins ISB Technical Specifications
About the Cummins ISB Engine
The Cummins ISB is one of the most versatile diesel engines ever produced, powering everything from Ram pickup trucks to medium-duty commercial vehicles and school buses. The ISB lineage traces back to the legendary 5.9L B-series engine that first appeared in the Dodge Ram in 1989. In 2007, Cummins increased the displacement to 6.7L and introduced the ISB6.7, which has become the standard diesel engine for Ram 2500/3500 trucks. In medium-duty applications, the ISB6.7 delivers 200-325 hp and is the most popular engine in its class for delivery trucks, school buses, and vocational vehicles. The pickup truck version produces up to 420 hp and an industry-leading 1,075 lb-ft of torque, making it the most powerful diesel in the light-duty truck segment.
Cummins ISB Strengths
- Industry-leading torque in the pickup truck segment (up to 1,075 lb-ft)
- Proven B-series architecture with decades of refinement
- Excellent aftermarket support for both stock and performance applications
- Available in both pickup truck and medium-duty commercial configurations
- Holset VGT turbo provides excellent throttle response and low-end torque
- Widely used in school buses — parts availability is exceptional
Common Cummins ISB Issues (Addressed in Our Remanufactured Engines)
- VP44 injection pump failure on 1998-2002 models (5.9L) is the most common issue
- Exhaust manifold cracking on 2007-2012 6.7L models
- Turbo actuator failure can cause limp mode and reduced power
- EGR valve carbon buildup on 2007-2012 models restricts airflow
- Head gasket failure on 2007-2009 6.7L models due to head bolt design
- Fuel dilution in oil on DPF-equipped models during frequent regeneration cycles
Vehicles with the Cummins ISB
Available Cummins ISB Remanufactured Engines
Cummins ISB Buying Guide
When purchasing a remanufactured Cummins ISB, first determine whether you need the pickup truck version (6.7L for Ram 2500/3500) or the medium-duty version (6.7L for commercial trucks/buses). The engines have different ECM calibrations, turbo configurations, and accessory drives. For Ram trucks, verify the model year — 2007-2012 and 2013+ have significant differences in emissions equipment. A quality remanufactured ISB should include a new or rebuilt turbo, updated EGR components, and fresh injectors.
Frequently Asked Questions — Cummins ISB
How much does a remanufactured Cummins 6.7L engine cost?
A remanufactured Cummins 6.7L ISB engine for Ram 2500/3500 trucks typically costs between $5,500 and $9,000 depending on the model year and configuration. Earlier 2007-2012 models are generally less expensive than 2019+ models with updated emissions equipment. Medium-duty commercial versions may differ in price. Call (631) 991-7700 for an exact quote.
Is the Cummins 6.7 a good engine?
Yes, the Cummins 6.7L ISB is an outstanding engine. It produces more torque than any other diesel in the light-duty truck segment and has proven reliability across millions of Ram trucks. The 6.7L builds on decades of B-series refinement and is backed by Cummins' reputation for durability. With proper maintenance, these engines regularly exceed 300,000 miles.
What are common Cummins 6.7L problems?
Common issues include exhaust manifold cracking (2007-2012), turbo actuator failure, EGR valve carbon buildup, and head gasket failure on early models. The 2013+ models addressed many of these issues with updated designs. Our remanufactured engines include fixes for all known problems.
What is the difference between the 5.9L and 6.7L Cummins?
The 5.9L Cummins was produced from 1989-2007 in two main variants: the 12-valve (mechanical injection, 1989-1998) and 24-valve (electronic injection, 1998-2007). The 6.7L replaced it in 2007 with increased displacement, a variable geometry turbo, and significantly more power. The 5.9L is prized for its simplicity, while the 6.7L offers superior performance.
How long does a Cummins 6.7L engine last?
A well-maintained Cummins 6.7L can last 300,000 to 500,000+ miles in pickup truck applications. Commercial versions in medium-duty trucks and school buses often exceed 400,000 miles. Key maintenance items include regular oil changes, DEF system service, and coolant system maintenance.
Can I put a Cummins 6.7L in an older Ram truck?
While technically possible, swapping a 6.7L into an older Ram requires significant modifications including a different transmission, wiring harness, ECM, and exhaust system. It's generally more practical and cost-effective to install the correct engine for your truck's model year. Contact us for advice on the best engine option for your specific application.
Cummins Troubleshooting Guides
Cummins ISX Problems
6 common ISX issues: EGR cooler, injectors, cam followers, turbo failures.
Read Guide →Cummins ISB / B6.7 Problems
EGR, turbo VGT, injector, DPF/SCR, and oil leak issues explained.
Read Guide →Diesel Engine Cost Guide
Complete pricing for remanufactured Cummins engines by model.
Read Guide →Reman vs Rebuilt Engines
Which option is right for your Cummins? Compare quality, cost, and warranty.
Read Guide →Installation Guide
Step-by-step guide for installing your remanufactured Cummins engine.
Read Guide →