Bore, stroke, displacement and compression for all 4 Acura Honda C-series engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 164.7–196 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.425–3.543" |
| Stroke | 2.953–3.307" |
| Compression | 9.0–10.2:1 |
| Advertised power | 160–290 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| C32A | 196 ci | 3.5433" × 3.3071" | 9.6:1 | 200 |
| C32B | 196 ci | 3.5433" × 3.3071" | 10.2:1 | 290 |
| C30A | 183.1 ci | 3.5433" × 3.0709" | 10.2:1 | 270 |
| C27A | 164.7 ci | 3.4252" × 2.9528" | 9:1 | 160 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
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.