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Dodge 4G64 specs: 143 ci (2.4L) 4-cylinder, 3.405 x 3.937 in (86.5 x 100 mm) bore and stroke. Built 1990–1993. Used in the Dodge Ram 50.
The Dodge 4G64 is undersquare — the 3.937" stroke exceeds the 3.4055" bore by 13.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.937" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 35.8 ci (586 cc).
4 factory variants share these dimensions across 1990–1993.
| Displacement | 143 ci / 2.4 L |
|---|---|
| Bore | 3.4055" |
| Stroke | 3.937" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.865 |
| Fuel type | gas |
|---|---|
| Years | 1990–1993 |
| Bore/stroke character | 0.865 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,937 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.8 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 |
|---|---|---|
| 1990 | — | 4G64 |
| 1991 | — | 4G64 |
| 1992 | — | 4G64 |
| 1993 | — | 4G64 |
1 factory vehicle, 1990–1993. Each year opens that model's engine table.