Bore, stroke, displacement and compression for all 4 Honda H-series engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 132–139 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.425" |
| Stroke | 3.571–3.740" |
| Compression | 9.8–10.6:1 |
| Advertised power | 160–200 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| H23A VTEC | 139 ci | 3.4252" × 3.7402" | 10.6:1 | 200 |
| H23A | 139 ci | 3.4252" × 3.7402" | 9.8:1 | 160 |
| H22A4 | 132 ci | 3.4252" × 3.5709" | 10:1 | 195 |
| H-series · 3.425" × 3.571" · 10.6:1 | 132 ci | 3.4252" × 3.5709" | 10.6:1 | 190–200 |
Every engine here shares a 3.4252" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.
2 of 4 are undersquare — stroke larger than bore, favouring torque low in the range.
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.