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| Production Years: | 2003 - 2007 | 1998 - 2007.5 | 2006 - 2007.5 |
| 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 | 5.9 liters, 359 cubic inches | 6.6 liters, 403 cubic inches |
| Compression Ratio: | 18.0:1 | 16.3:1 (17.3:1 in HO version) | 16.8:1 |
| Bore x Stroke: | 3.74 x 4.13 inches | 4.02 x 4.72 inches | 4.06 x 3.90 inches |
| Injection System: | Hydraulic electronic unit injection (HEUI) | Bosch rotary injection pump. Switched to high pressure common rail injection in 2003 | High pressure common rail, CP3 injection pump |
| Aspiration: | Variable Geometry Turbocharger (VGT) | Holset Turbocharger | Variable Geometry Turbocharger (VGT) |
| Valvetrain: | overhead cam, 4 valves per cylinder | over head valve, 4 valves per cylinder | over head valve, 4 valves per cylinder |
| Weight: | approx. 966 lbs | 1,150 lbs (approx.) | 835 lbs (approx.) |
| Peak Horsepower:* | 325 hp @ 3,300 RPM | 325 hp @ 2,900 RPM (high output model) |
360 hp @ 3,200 RPM |
| Peak Torque:* | 570 lb-ft @ 2,000 RPM | 610 lb-ft @ 1,600 RPM (high output model) |
650 lb-ft @ 1,600 RPM |
| Reputation: | Stock torque to yield (TTY) head bolts proved to be a weak link. The overall engine design is good, though the emissions equipment proved to cause issues in some applications. Ford Power Stroke continues to outsell Cummins & Duramax. Overall a strong performer with good fuel economy. The Ford Torqshift 5-speed automatic has a good reputation for strength, crisp shifts, & appropriate shift timing. | Brute strength, builds torque at low RPM. Lots of aftermarket engine modifications available. More turbo lag than Ford & Chevrolet, and typically slower in stock form. Medium duty engine in light duty trim. The stock Dodge transmissions are significantly weaker than Ford or General Motors transmissions. They have a reputation of failure when engines are tuned to produce anything over the stock power rating. | Like the other 3 Duramax engines, a large portion of the diesel community ridicule the Duramax for its aluminum heads & small connecting rods. However, the LBZ is considered the "hot rod" of Duramax diesels due to its power potential when complimented with aftermarket tuning. The Allison 1000 6-speed automatic transmission remains a strong part of the Duramax package. |
| Applications: | 2003 - 2007 Ford Super Duty; F250, F350, F450, F550, F650. | 1998 - 2007.5 Dodge Ram 2500 & 3500 trucks. | 2001 - 2004 Chevrolet & GMC HD 2500 & 3500 trucks. |
*Peak horsepower & torque refers to the highest advertised power output during the engine's production. |
