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Ford 6.8L OHV 2-valve V8 specs: 412 ci (6.8L) 8-cylinder, 4.221 x 3.681 in (107.2 x 93.5 mm) bore and stroke, 10.8:1 compression. Rod ratio and piston speed.
The Ford 6.8L OHV 2-valve V8 is oversquare — the 4.2205" bore exceeds the 3.681" stroke by 14.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.681" stroke puts mean piston speed at 4,000 ft/min around 6,500 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 51.5 ci (844 cc).
10.8:1 is in the range that usually runs on pump premium.
It is one of 5 engines in the Godzilla family, the smallest at 412 ci.
| Displacement | 412 ci / 6.8 L |
|---|---|
| Bore | 4.2205" |
| Stroke | 3.681" |
| Cylinders | 8 |
| Compression ratio | 10.8:1 |
| Bore/stroke ratio | 1.147 |
| Fuel type | gas |
|---|
| Bore/stroke character | 1.147 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,681 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 51.5 ci |
| Static compression | 10.8:1 — in the range that usually runs on pump premium |
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