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| Production Years: | 1994.5 - 2003 | 1998 - 2007.5 | 2001 - 2004 |
| Manufacturer: | International | Cummins | Isuzu |
| Block/Head Material: | Iron/Iron | Iron/Iron | Iron/Aluminum |
| Configuration: | V-8 | Inline 6 | V-8 |
| Displacement: | 7.3 liters, 444 cubic inches | 5.9 liters, 359 cubic inches | 6.6 liters, 403 cubic inches |
| Compression Ratio: | 17.5:1 | 16.3:1 (17.3:1 in HO version) | 17.5:1 |
| Bore x Stroke: | 4.11 x 4.18 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: | Turbocharged | Holset Turbocharger | Turbocharged |
| Valvetrain: | over head valve, 2 valves per cylinder | over head valve, 4 valves per cylinder | over head valve, 4 valves per cylinder |
| Weight: | 920 lbs (approx.) | 1,150 lbs (approx.) | 835 lbs (approx.) |
| Peak Horsepower:* | 275 hp @ 2,800 RPM | 235 hp @ 2,700 RPM (2003 model year**) |
300 hp @ 3,100 RPM |
| Peak Torque:* | 525 lb-ft @ 1,600 RPM | 460 lb-ft. @ 1,400 RPM (2003 model year**) |
520 lb-ft @ 1,800 RPM |
| Reputation: | Reliable, powerful, & durable. More 7.3L Power Strokes are on the road today than GM and Dodge diesel trucks combined. Considered one of the best light/medium duty diesel engines ever produced. | 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. | Ridiculed for having aluminum heads on a diesel & smaller connecting rods than the Power Stroke & Cummins. Quick turbo spooling and good fuel economy are its well known traits. |
| Applications: | 1994.5 - 2003 Ford F250, F350, F450, F550, F650 trucks. | 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 unless otherwise noted. |
**Cummins horsepower & torque output includes peak advertised as well as the 2003 model year so that a fair comparison can be made to the Duramax LB7 & the 7.3L Power Stroke, both of which ended production several years before the 5.9L Cummins. |
