Ignition Timing
Set timing with engine at 850 RPM with distributor vacuum line disconnected and plugged
.
- DETONATION NOTE:
If detonation occurs at proper ignition timing setting (due to low octane fuel or excessive carbon build-up), timing should be retarded not more than 2 1/2°. If extra high octane fuel is used, timing may be advanced beyond specified setting if there is no detonation.
| 425" 2-Bbl. Hi. Comp |
5° BTDC |
| All Others |
7.5° BTDC |
Courtesy of GENERAL MOTORS COMPANY
Set with brake applied, Auto. Trans. in Drive, Air Cond. OFF, transmission stator in high angle position, and hot idle compensator held closed. Auto. Level Control Pump must be inoperative.
| Engine |
Synchro-Mesh |
Auto. Trans. |
| 330" |
600 RPM |
500 RPM |
| |
With Air Cond. |
600 RPM |
575 RPM |
| |
With A.I.R. |
650 RPM |
600 RPM |
| |
With Air Cond. & A.I.R. |
650 RPM |
600 RPM |
| 400" |
600 RPM |
550 RPM |
| |
With Air Cond. |
600 RPM |
550 RPM |
| |
With A.I.R. |
650 RPM |
600 RPM |
| |
With Air Cond. & A.I.R. |
650 RPM |
600 RPM |
| 425" |
550 RPM |
500 RPM |
| |
With Air Cond. |
575 RPM |
575 RPM |
| |
With A.I.R. |
600 RPM |
500 RPM |
| |
With Air Cond.. & A.I.R. |
600 RPM |
575 RPM |
| 425" |
|
|
| |
With C.C.S. |
600 RPM |
600 RPM |