Bore, stroke, displacement and compression for all 8 Ram PowerTech engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 226–287 ci |
|---|---|
| Cylinders | 6, 8 |
| Bore | 3.661" |
| Stroke | 3.413–3.575" |
| Compression | 9.0–9.7:1 |
| Advertised power | 210–310 hp |
| Years | 2000–2013 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 47 Powertech V8 | 287 ci | 3.6614" × 3.4134" | 9:1 | 235 |
| EVA (FlexFuel) | 287 ci | 3.6614" × 3.4134" | 9.7:1 | 310 |
| PowerTech 4.7 | 287 ci | 3.6614" × 3.4134" | — | 230–310 |
| PowerTech 4.7 H.O. | 287 ci | 3.6614" × 3.4134" | — | 260 |
| PowerTech (2009–2013) | 287 ci | 3.6614" × 3.4134" | — | 310 |
| 37 Powertech V6 | 226 ci | 3.6614" × 3.5748" | 9.1:1 | 210 |
| PowerTech 3.7 | 226 ci | 3.6614" × 3.5748" | — | 210–215 |
| PowerTech (2009–2012) | 226 ci | 3.6614" × 3.5748" | — | 215 |
Every engine here shares a 3.6614" bore; displacement varies by stroke alone, which is the signature of a family built on one block with different cranks.
5 of 8 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.