GMC LR4, Engine
| Engine capacity | 4,785 cm³ |
| Maximum power (range), hp | 255 - 285 |
| Maximum torque, N*m (kg*m) at rpm. | 386 (39) / 4000 |
| Fuel used | Petrol |
| Engine type | V-shaped, 8-cylinder |
| Maximum power, hp (kW) at rpm | 255 (188) / 5200 |
| Compression Ratio (Range) | 8.8 - 9.5 |
| Cylinder diameter (range), mm | 96.5 |
| Piston stroke (range), mm | 83.8 |
| Valve drive | OHV |
| Number of valves per cylinder (range) | 2 - 4 |