Pontiac 207ci specs: 3.62 x 3.31 in (91.9 x 84.1 mm) bore and stroke, shared by all 4 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 204–207 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.620" |
| Stroke | 3.310" |
| Compression | 9.0–10.0:1 |
| Advertised power | 160–215 hp |
| Years | 1991–2005 |
| Cylinder head data | 1 of 4 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Pontiac 207ci · 3.620" × 3.310" · 9:1 | 207 ci | 3.62" × 3.31" | 9:1 | 160 |
| Pontiac 207ci · 3.620" × 3.310" · 10:1 | 207 ci | 3.62" × 3.31" | 10:1 | 170–210 |
| LQ1 | 207 ci | 3.62" × 3.31" | — | 210–215 |
| Pontiac 207ci · 3.620" × 3.310" · 10:1 | 204 ci | 3.62" × 3.31" | 10:1 | 170 |
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.