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Dodge 4G32 specs: 97 ci (1.6L) 4-cylinder, 3.028 x 3.386 in (76.9 x 86 mm) bore and stroke. Rated 77-80 hp, 1978–1979. SOHC. Rod ratio and piston speed.
The Dodge 4G32 is undersquare — the 3.3858" stroke exceeds the 3.0276" bore by 10.6% — a layout that trades peak RPM for leverage and torque low in the range. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.3 ci (397 cc).
It is one of 3 engines in the Dodge 97ci family, the smallest at 97 ci. 2 factory variants share these dimensions, rated from 77 to 80 hp across 1978–1979.
| Displacement | 97 ci / 1.6 L |
|---|---|
| Bore | 3.0276" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.894 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 77–80 hp |
| Years | 1978–1979 |
| Bore/stroke character | 0.894 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.3 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 |
|---|---|---|
| 1978 | 77 hp | 4G32 |
| 1979 | 80 hp | 4G32 |