Bore, stroke, displacement and compression for all 4 Subaru FB engines. Compare variants side by side.
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| FB25 | 152.4 ci | 3.7008" × 3.5433" | 10.3:1 | 170–182 |
| FB20 | 122 ci | 3.3071" × 3.5433" | 10.5:1 | 148 |
| FB20 | 121.7 ci | 3.3071" × 3.5433" | 10.5:1 | 148–152 |
| FB16 | 97.6 ci | 3.1024" × 3.2283" | 10.5:1 | 114 |