American Motors 327ci specs: 4.00 x 3.25 in (101.6 x 82.6 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings.
| Displacement | 327 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.000" |
| Stroke | 3.250" |
| Compression | 8.7–9.7:1 |
| Advertised power | 250–270 hp |
| Years | 1960–1966 |
| Cylinder head data | 2 of 2 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| American Motors 327ci · 4" × 3.25" · 8.7:1 | 327 ci | 4" × 3.25" | 8.7:1 | 250 |
| American Motors 327ci · 4" × 3.25" · 9.7:1 | 327 ci | 4" × 3.25" | 9.7:1 | 270 |
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.