Buick GM Buick Nailhead 425, Engine
| Engine capacity | 6,970 cm³ |
| Maximum power (range), hp | 340 - 360 |
| Maximum torque, N*m (kg*m) at rpm. | 631 (64) / 2800 |
| Fuel used | Petrol |
| Fuel consumption, l/100 km | 23.2 - 29.7 |
| Engine type | V-shaped, 8-cylinder |
| Additional engine information | Carter AFG 4-barrel carburetor |
| Maximum power, hp (kW) at rpm | 340 (250) / 4400 |
| Compression Ratio (Range) | 10.25 |
| Cylinder diameter (range), mm | 109.54 |
| Piston stroke (range), mm | 92.46 |
| Cooling system (range), l | 17.5 |
| Engine lubrication system (range), l | 3.8 |
| Valve drive | OHV |
| Number of valves per cylinder (range) | 2 |