| Production | 1968-1969 |
| Fuel | Petrol |
| Motor Type | V8 |
| Displacement (cc/Cid) | 6554 / 400 |
| Number of Valves | 16 |
| Power | 390hp / 287kW @ 5800rpm |
| Torque | 597Nm / 440lb ft @ 3200rpm |
| Layout | ? |
| Gearbox | Manual |
| Number of gears (transmission) | 3 |
| Top Speed (km/h / mph) | ? |
| Acceleration (0 to 100km/h / 0 to 60mph) | ? |
| Fuel consumption extra-urban/highway (l/100km / mpg(US)) | ? |
| Fuel consumption urban/city (l/100km / mpg(US)) | ? |
| Fuel consumption mixed (l/100km / mpg(US)) | ? |
| Length (cm/inches) | 510 / 201 |
| Width (cm/inches) | 192 / 76 |
| Height (cm/inches) | 136 / 54 |
| Wheelbase (cm/inches) | 285 / 112 |
| Weight (kg / lbs) | 1680 / 3704 |
| Trunk Volume (dm3 / cu ft (US)) | ? |
| Tank Capacity (l / gal (US)) | 76 / 20.1 |
| Tire size | 7.75 - 14 |
| Others | ? |
Buick GS Convertible 6.6 Buick 400 Big-Block V8 Stage 1 390hp
