Bore, stroke, displacement and compression for all 6 Chevrolet 396ci engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 396 ci |
|---|---|
| Cylinders | 8 |
| Bore | 4.065–4.094" |
| Stroke | 3.766–3.825" |
| Compression | 9.0–11.6:1 |
| Advertised power | 265–425 hp |
| Years | 1965–2015 |
| Cylinder head data | 4 of 6 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Chevrolet 396ci · 4.065" × 3.825" · 11.6:1 | 396 ci | 4.065" × 3.825" | 11.6:1 | 390 |
| Chevrolet 396ci (1968–1969) | 396 ci | 4.094" × 3.766" | — | 310 |
| Chevrolet 396ci · 4.094" × 3.766" · 10:1 | 396 ci | 4.094" × 3.766" | 10:1 | 325 |
| Chevrolet 396ci · 4.094" × 3.766" · 11:1 | 396 ci | 4.094" × 3.766" | 11:1 | 375–425 |
| Chevrolet 396ci · 4.094" × 3.766" · 10.25:1 | 396 ci | 4.094" × 3.766" | 10.25:1 | 325–360 |
| Chevrolet 396ci · 4.094" × 3.766" · 9:1 | 396 ci | 4.094" × 3.766" | 9:1 | 265 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 9:1 to 11.6:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.