Pontiac 217ci specs: 3.701 x 3.37 in (94 x 85.6 mm) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 217 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.701" |
| Stroke | 3.370" |
| Compression | 10.2:1 |
| Advertised power | 256 hp |
| Years | 2008–2009 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| LY7 | 217 ci | 3.7008" × 3.3701" | 10.2:1 | 256 |
This family is represented by a single engine in the database: 217 ci, 6 cylinders, a 3.7008" × 3.3701" bore and stroke.
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.