American Motors 151ci specs: 4.00 x 3.00 in (101.6 x 76.2 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.
| Displacement | 151 ci |
|---|---|
| Cylinders | 4 |
| Bore | 4.000" |
| Stroke | 3.000" |
| Compression | 8.2:1 |
| Advertised power | 82 hp |
| Years | 1980–1983 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Iron Duke | 151 ci | 4" × 3" | 8.2:1 | — |
| GM 151 | 151 ci | 4" × 3" | 8.2:1 | 82 |
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.