See other engines in this family
Jeep AMC 232 1-bbl specs: 232 ci (3.8L) 6-cylinder, 3.752 x 3.50 in (95.3 x 88.9 mm) bore and stroke. Rated 100 hp, 1972–1978. Used in the Jeep CJ. OHV.
The Jeep AMC 232 1-bbl is oversquare — the 3.752" bore exceeds the 3.5" stroke by 7.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.5" stroke puts mean piston speed at 4,000 ft/min around 6,850 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 38.7 ci (634 cc).
It is one of 7 engines in the AMC I6 family, the smallest at 232 ci. 7 factory variants share these dimensions, rated at 100 hp across 1972–1978.
| Displacement | 232 ci / 3.8 L |
|---|---|
| Bore | 3.752" |
| Stroke | 3.5" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 1.072 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 100 hp |
| Years | 1972–1978 |
| Bore/stroke character | 1.072 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,500 ft/min — conservative for a street engine |
| Displacement per cylinder | 38.7 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 |
|---|---|---|
| 1972 | 100 hp | AMC 232 1-bbl |
| 1973 | 100 hp | AMC 232 1-bbl |
| 1974 | 100 hp | AMC 232 1-bbl |
| 1975 | 100 hp | AMC 232 1-bbl |
| 1976 | 100 hp | AMC 232 1-bbl |
| 1977 | 100 hp | AMC 232 1-bbl |
| 1978 | 100 hp | AMC 232 1-bbl |