Bore, stroke, displacement and compression for all 4 Buick High Feature V6 engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 217–222.7 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.701–3.740" |
| Stroke | 3.370–3.378" |
| Compression | 10.2–11.5:1 |
| Advertised power | 255–310 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| LGX | 222.7 ci | 3.7402" × 3.378" | 11.5:1 | 310 |
| LY7 | 217 ci | 3.7008" × 3.3701" | 10.2:1 | 255 |
| LLT | 217 ci | 3.7008" × 3.3701" | 11.3:1 | 288 |
| LFX | 217 ci | 3.7008" × 3.3701" | 11.5:1 | 304 |
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.