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Ford 6.7L Power Stroke High Output specs: 406 ci (6.7L) 8-cylinder, 3.90 x 4.25 in (99.1 x 108 mm) bore and stroke. Rated 500 hp, 2023–2026.
The Ford 6.7L Power Stroke High Output is undersquare — the 4.25" stroke exceeds the 3.9" bore by 8.2% — a layout that trades peak RPM for leverage and torque low in the range. The 4.25" stroke puts mean piston speed at 4,000 ft/min around 5,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 50.8 ci (832 cc).
It is one of 3 engines in the Power Stroke 6.7 family, all of them 406 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated at 500 hp across 2023–2026.
| Displacement | 406 ci / 6.7 L |
|---|---|
| Bore | 3.9" |
| Stroke | 4.25" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 0.918 |
| Block material | compacted graphite iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | diesel |
| Advertised HP | 500 hp |
| Years | 2023–2026 |
| Bore/stroke character | 0.918 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,250 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 50.8 ci |
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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 |
|---|---|---|
| 2023 | 500 hp | 6.7L Power Stroke High Output |
| 2024 | 500 hp | 6.7L Power Stroke High Output |
| 2026 | 500 hp | 6.7L Power Stroke High Output |