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International BG-265 specs: 265 ci 6-cylinder, 3.688 x 4.125 in (93.7 x 104.8 mm) bore and stroke. Built 1965–1968. Used in the International Pickup.
The International BG-265 is undersquare — the 4.125" stroke exceeds the 3.6875" bore by 10.6% — a layout that trades peak RPM for leverage and torque low in the range. The 4.125" stroke puts mean piston speed at 4,000 ft/min around 5,800 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 44.2 ci (724 cc).
4 factory variants share these dimensions across 1965–1968.
| Displacement | 265 ci |
|---|---|
| Bore | 3.6875" |
| Stroke | 4.125" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.894 |
| Fuel type | gas |
|---|---|
| Years | 1965–1968 |
| Bore/stroke character | 0.894 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,125 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 44.2 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1965 | — | BG-265 |
| 1966 | — | BG-265 |
| 1967 | — | BG-265 |
| 1968 | — | BG-265 |
2 factory vehicles, 1965–1968. Each year opens that model's engine table.