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Ford 262 Six specs: 262.5 ci (4.3L) 6-cylinder, 3.718 x 4.03 in (94.4 x 102.4 mm) bore and stroke. Rated 152 hp, 1964. Used in the Ford F-100 and Ford F-250.
The Ford 262 Six is undersquare — the 4.03" stroke exceeds the 3.718" bore by 7.7% — a layout that trades peak RPM for leverage and torque low in the range. The 4.03" stroke puts mean piston speed at 4,000 ft/min around 5,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 43.8 ci (717 cc).
It is one of 2 engines in the 262 Truck Six family, all of them 262.5 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 262.5 ci / 4.3 L |
|---|---|
| Bore | 3.718" |
| Stroke | 4.03" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.923 |
| Fuel type | gas |
|---|---|
| Advertised HP | 152 hp |
| Years | 1964 |
| Bore/stroke character | 0.923 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,030 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 43.8 ci |
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2 factory vehicles, 1964. Each year opens that model's engine table.