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Ford Power Stroke 7.3 specs: 444 ci (7.3L) 8-cylinder, 4.051 x 4.358 in (102.9 x 110.7 mm) bore and stroke, 17.5:1 compression. Rated 210-250 hp. OHV.
The Ford Power Stroke 7.3 is undersquare — the 4.3583" stroke exceeds the 4.0512" bore by 7.0% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.3583" stroke, mean piston speed reaches 4,000 ft/min at only 5,500 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 8 cylinders displaces 55.5 ci (909 cc).
At 17.5:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 2 engines in the Power Stroke 7.3 family, all of them 444 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated from 210 to 250 hp. Factory fitments include the Ford F-Series (F-250, F-350), Ford E-Series (E-350, E-450), Ford Excursion (early production) and 2 others.
| Displacement | 444 ci / 7.3 L |
|---|---|
| Bore | 4.0512" |
| Stroke | 4.3583" |
| Cylinders | 8 |
| Compression ratio | 17.5:1 |
| Bore/stroke ratio | 0.93 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | diesel |
| Advertised HP | 210–250 hp |
| Bore/stroke character | 0.930 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,358 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 55.5 ci |
| Static compression | 17.5:1 — high enough that pump premium or better is normally required |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 210 hp | T444E (early) |
| — | 235 hp | T444E (late) |
| — | 250 hp | T444E (late HO) |