American Motors 304ci specs: 3.75 x 3.44 in (95.3 x 87.4 mm) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings.
| Displacement | 304 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.750" |
| Stroke | 3.440" |
| Compression | 8.7–9.0:1 |
| Advertised power | 121–210 hp |
| Years | 1970–1979 |
| Cylinder head data | 2 of 3 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| American Motors 304ci (1971–1978) | 304 ci | 3.75" × 3.44" | — | 121–210 |
| American Motors 304ci · 3.75" × 3.44" · 9:1 | 304 ci | 3.75" × 3.44" | 9:1 | 210 |
| American Motors 304ci · 3.75" × 3.44" · 8.69:1 | 304 ci | 3.75" × 3.44" | 8.69:1 | 125 |
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.