Engine Mechanical Specifications-Unit Repair
| General Data | Engine Type | In-Line-6 |
| Displacement | 4.2 L | |
| RPO (VIN Code) | LL8 | |
| Bore | 3.66 inch | |
| Stroke | 4.02 inch | |
| Compression Ratio | 10:1 | |
| Firing Order | 1-5-3-6-2-4 | |
| Oil Pressure (At the sending unit) Warm - Minimum | 112 psi @ 1200 RPM | |
| Spark Plug Gap | Maximum | 0.050 inch |
| Minimum | 0.044 inch |