Pontiac 326ci specs: 3.719 x 3.75 in (94.5 x 95.3 mm) bore and stroke, shared by all 6 versions. Displacement, compression and factory ratings.
| Displacement | 326 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.719" |
| Stroke | 3.750" |
| Compression | 9.2–10.5:1 |
| Advertised power | 250–285 hp |
| Years | 1963–1967 |
| Cylinder head data | 1 of 6 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Pontiac 326ci (1967) · 250 hp | 326 ci | 3.719" × 3.75" | 9.201:1 | 250 |
| Pontiac 326ci (1967) · 285 hp | 326 ci | 3.719" × 3.75" | 10.501:1 | 285 |
| Pontiac 326ci (1963) | 326 ci | 3.719" × 3.75" | — | 250–280 |
| 326 V8 2-bbl | 326 ci | 3.719" × 3.75" | — | 250 |
| 326 V8 4-bbl | 326 ci | 3.719" × 3.75" | — | 280 |
| 326 HO 4-bbl | 326 ci | 3.719" × 3.75" | — | 285 |
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.