Peterbilt Caterpillar C12, Engine
| Engine capacity | 12,000 cm³ |
| Maximum power (range), hp | 335 - 390 |
| Maximum torque, N*m (kg*m) at rpm. | 1,900 (194) / 1200 |
| Fuel used | Diesel fuel |
| Engine type | In-line, 6-cylinder |
| Additional engine information | direct fuel injection |
| Maximum power, hp (kW) at rpm | 335 (246) / 2200 |
| Compression Ratio (Range) | 17 |
| Cylinder diameter (range), mm | 130 |
| Piston stroke (range), mm | 157 |
| Supercharger | Turbine |
| Number of valves per cylinder (range) | 4 |