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Chrysler 4G32 specs: 97.1 ci (1.6L) 4-cylinder, 3.173 x 3.071 in (80.6 x 78 mm) bore and stroke. Rated 77-80 hp, 1978–1979. Used in the Dodge Challenger. OHV.
The Chrysler 4G32 is close to square: 3.1732" bore against 3.0709" stroke, within 3.3%, which splits the difference between a high-revving layout and a torque layout. The 3.0709" stroke does not reach 4,000 ft/min of mean piston speed until about 7,800 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 (398 cc).
It is one of 3 engines in the Chrysler 97ci family, all of them 97.1 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated from 77 to 80 hp across 1978–1979.
| Displacement | 97.1 ci / 1.6 L |
|---|---|
| Bore | 3.1732" |
| Stroke | 3.0709" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.033 |
| Valvetrain | OHV |
|---|---|
| Fuel type | gas |
| Advertised HP | 77–80 hp |
| Years | 1978–1979 |
| Bore/stroke character | 1.033 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,071 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 |