See other engines in this family
Ford Cummins ISB 5.9 specs: 359 ci (5.9L) 6-cylinder, 4.016 x 4.724 in (102 x 120 mm) bore and stroke. Built 2000–2004. Used in the Ford F-650 / F-750.
The Ford Cummins ISB 5.9 is undersquare — the 4.7244" stroke exceeds the 4.0157" bore by 15.0% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.7244" stroke, mean piston speed reaches 4,000 ft/min at only 5,100 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 6 cylinders displaces 59.8 ci (980 cc).
2 factory variants share these dimensions across 2000–2004.
| Displacement | 359 ci / 5.9 L |
|---|---|
| Bore | 4.0157" |
| Stroke | 4.7244" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.85 |
| Fuel type | diesel |
|---|---|
| Years | 2000–2004 |
| Bore/stroke character | 0.850 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,724 ft/min — above the 4,500 ft/min mark where most production bottom ends are considered at their limit |
| Displacement per cylinder | 59.8 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2000 | — | Cummins ISB 5.9 |
| 2004 | — | Cummins ISB 5.9 |
1 factory vehicle, 2000–2004. Each year opens that model's engine table.