Bore, stroke, displacement and compression for all 9 Infiniti VK engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 274–341.7 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.661–3.858" |
| Stroke | 3.256–3.622" |
| Compression | 9.8–11.2:1 |
| Advertised power | 276–400 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| VK56VD | 341.7 ci | 3.8583" × 3.622" | 11.2:1 | 400 |
| VK56DE | 341.7 ci | 3.8583" × 3.622" | 9.8:1 | 315 |
| VK56DE | 341 ci | 3.8583" × 3.622" | 9.8:1 | 315 |
| VK56VD | 341 ci | 3.8583" × 3.622" | 10.8:1 | 400 |
| VK50VE | 307 ci | 3.7598" × 3.4528" | 10.9:1 | 390 |
| VK50VE | 305.1 ci | 3.7598" × 3.4528" | 10.9:1 | 390 |
| VK45DE | 274.6 ci | 3.6614" × 3.2559" | 10.5:1 | 340 |
| VK45DD | 274.6 ci | 3.6614" × 3.2559" | 11:1 | 276 |
| VK45DE | 274 ci | 3.6614" × 3.2559" | 10.5:1 | 340 |
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.