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Ford Caterpillar 3126 / C7 specs: 442 ci (7.2L) 6-cylinder, 4.331 x 5.00 in (110 x 127 mm) bore and stroke. Built 2000. Used in the Ford F-650 / F-750.
The Ford Caterpillar 3126 / C7 is undersquare — the 5" stroke exceeds the 4.3307" bore by 13.4% — a layout that trades peak RPM for leverage and torque low in the range. With a 5" stroke, mean piston speed reaches 4,000 ft/min at only 4,800 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 73.7 ci (1,207 cc).
| Displacement | 442 ci / 7.2 L |
|---|---|
| Bore | 4.3307" |
| Stroke | 5" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.866 |
| Fuel type | diesel |
|---|---|
| Years | 2000 |
| Bore/stroke character | 0.866 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 5,000 ft/min — above the 4,500 ft/min mark where most production bottom ends are considered at their limit |
| Displacement per cylinder | 73.7 ci |
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1 factory vehicle, 2000. Each year opens that model's engine table.