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| Production Years: | 2003 - 2007 | 2007.5 - present | 2004 - 2006 |
| Manufacturer: | International | Cummins | Isuzu |
| Block/Head Material: | Iron/Iron | Iron/Iron | Iron/Aluminum |
| Configuration: | V-8 | Inline 6 | V-8 |
| Displacement: | 6.0 liters, 365 cubic inches | 6.7 liters, 408 cubic inches | 6.6 liters, 403 cubic inches |
| Compression Ratio: | 18.0:1 | 17.3:1 | 17.5:1 (Lowered to 16.8:1 in 2006) |
| Bore x Stroke: | 3.74 x 4.13 inches | 4.21 x 4.88 inches | 4.06 x 3.90 inches |
| Injection System: | Hydraulic electronic unit injection (HEUI) | high pressure common rail | High pressure common rail, CP3 injection pump |
| Aspiration: | Variable Geometry Turbocharger (VGT) | Variable geometry turbocharger (VGT) | Variable Geometry Turbocharger (VGT) |
| Valvetrain: | overhead cam, 4 valves per cylinder | overhead valve, 4 valves per cylinder | over head valve, 4 valves per cylinder |
| Weight: | approx. 966 lbs | N/A | 835 lbs (approx.) |
| Peak Horsepower:* | 325 hp @ 3,300 RPM | 350 hp @ 3,013 RPM | 320 hp @ 3,000 RPM (2006 figures) |
| Peak Torque:* | 570 lb-ft @ 2,000 RPM | 650 lb-ft. @ 1,500 RPM w/ auto trans 610 lb-ft. @ 1,500 RPM w/ man trans |
560 lb-ft @ 1,600 RPM (2006 figures) |
| Reputation: | The 5 speed Torqshift transmission that comes standard with the 6.0L Power Stroke is a definite strong point. The transmission features crisp, firm shifts and the Tow/Haul mode works much better and smarter than its competitor's. Some 6.0L are ridiculed for problems, but the 6.0L is a very strong and reliable engine with great towing characteristics. | One of the unique features of the 6.7L Cummins is the factory installed exhaust brake. The engine has proven to be a reliable design, much like the 5.9. Fuel economy seems to have suffered on the 6.7L when compared to the 5.9L, largely attributed to the engines increased displacement and a magnitude of emissions controls. In comparison to the 6.0L Power Stroke & 6.6L Duramax LLY, the 6.7L Cummins provides more peak power, but the others will have better fuel economy. | The Duramax LLY under went huge changes in 2006, which included a larger EGR, stronger bottom end components, and a increased maximum common rail injection pressure. As a result, the 2006 model has an additional 40 lb-ft. of torque and 10 horsepower over the previous LLY. The LLY is the first Duramax to recieve emissions controls. |
| Applications: | 2003 - 2007 Ford Super Duty; F250, F350, F450, F550, F650. | 2007.5 - present Ram 2500 & 3500. | 2004 - 2006 Chevrolet & GMC HD 2500 & 3500 trucks. |
*Peak horsepower & torque refers to the highest advertised power output during the engine's production. |
