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Ford 6.8L 2V SOHC specs: 415 ci (6.8L) 10-cylinder, 3.551 x 4.165 in (90.2 x 105.8 mm) bore and stroke, 9:1 compression. Rated 275 hp. SOHC.
The Ford 6.8L 2V SOHC is undersquare — the 4.1654" stroke exceeds the 3.5512" bore by 14.7% — a layout that trades peak RPM for leverage and torque low in the range. The 4.1654" stroke puts mean piston speed at 4,000 ft/min around 5,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 10 cylinders displaces 41.5 ci (680 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 16 engines in the Modular family, the largest at 415 ci. Factory fitments include the Ford F-Series Super Duty, Ford E-Series, Ford Excursion.
| Displacement | 415 ci / 6.8 L |
|---|---|
| Bore | 3.5512" |
| Stroke | 4.1654" |
| Cylinders | 10 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 0.853 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 275 hp |
| Bore/stroke character | 0.853 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,165 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 41.5 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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