Bore, stroke, displacement and compression for all 5 Lincoln Duratec engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 152–227 ci |
|---|---|
| Cylinders | 4, 6 |
| Bore | 3.244–3.760" |
| Stroke | 3.130–3.937" |
| Compression | 10.0–12.3:1 |
| Advertised power | 170–305 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 37 Duratec V6 | 227 ci | 3.7598" × 3.4134" | 10.3:1 | 305 |
| 35 Duratec V6 | 213 ci | 3.6417" × 3.4134" | 10.3:1 | 265 |
| 30 Duratec V6 | 182 ci | 3.5039" × 3.1299" | 10:1 | 221 |
| 25 Duratec V6 | 155.2 ci | 3.2441" × 3.1299" | 10:1 | 170 |
| 2.5L I4 PHEV | 152 ci | 3.5039" × 3.937" | 12.3:1 | 266 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 10:1 to 12.3:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
The family mixes oversquare and undersquare designs, so members behave quite differently despite sharing a name.
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.