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International BG-241 specs: 241 ci 6-cylinder, 3.563 x 4.018 in (90.5 x 102.1 mm) bore and stroke, 7.5:1 compression. Built 1964–1968.
The International BG-241 is undersquare — the 4.018" stroke exceeds the 3.5625" bore by 11.3% — a layout that trades peak RPM for leverage and torque low in the range. The 4.018" 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 40.2 ci (658 cc).
7.5:1 is low by modern standards and generally happy on regular pump fuel.
5 factory variants share these dimensions across 1964–1968.
| Displacement | 241 ci |
|---|---|
| Bore | 3.5625" |
| Stroke | 4.018" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 7.5:1 |
| Bore/stroke ratio | 0.887 |
| Fuel type | gas |
|---|---|
| Years | 1964–1968 |
| Bore/stroke character | 0.887 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,018 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.2 ci |
| Static compression | 7.5:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1964 | — | BG-241 |
| 1965 | — | BG-241 |
| 1966 | — | BG-241 |
| 1967 | — | BG-241 |
| 1968 | — | BG-241 |
2 factory vehicles, 1964–1968. Each year opens that model's engine table.