Ignition Timing
Ignition timing is checked or adjusted with engine at normal operating temperature, distributor vacuum line disconnected and plugged, transmission in Neutral and engine at normal idle.
Ignition Timing Specifications
| Application | Man. Trans. | Auto. Trans. | |
|---|---|---|---|
| 307" | |||
| Light Duty | 4° BTDC | 8° BTDC | |
| Heavy Duty | TDC | TDC | |
| 350" | |||
| Light Duty | 8° BTDC | 12° BTDC | |
| Heavy Duty | 4° BTDC | 4° BTDC | |
| 454" | |||
| Light Duty | 10° BTDC | 10° BTDC | |
| H/D (Federal) | 10° BTDC | 10° BTDC | |
| H/D (Calif.) | 5° BTDC | 8° BTDC | |