Instead of a specific degree number, you need to follow this procedure:
1. Consult your owner's manual or a Ford shop manual for that specific year and engine. This is the *most* important step. The manual will provide the correct base timing and any procedures for setting it.
2. Use a timing light. This is essential. You cannot accurately set timing without one.
3. Set the engine to idle. Make sure the engine is warmed up to operating temperature.
4. Find the timing tab (or mark) on the harmonic balancer. This is where you'll read the timing with the light.
5. Connect the timing light properly. Ensure the clamp is securely fastened to the No. 1 spark plug wire.
6. Locate the distributor. You will likely need to adjust the distributor to change the timing.
7. Adjust the distributor: Your owner's manual will tell you how to do this, but generally, turning the distributor clockwise advances the timing, while counter-clockwise retards it. Do this in small increments.
8. Check the timing: Shine the timing light on the harmonic balancer and read the timing. Your owner's manual will specify the initial timing and possibly additional settings for vacuum advance.
9. Repeat steps 7 and 8 until the timing is correct.
Important Considerations:
* Vacuum Advance: The vacuum advance on your distributor plays a significant role in timing. Make sure this is connected and functioning correctly; it will advance the timing under load and at higher RPM. The initial timing setting usually doesn't include vacuum advance.
* Dwell: Incorrect dwell can also significantly affect timing and spark output. A dwell meter is helpful here.
* Mechanic: If you are uncomfortable working on your car's ignition system, it's best to take it to a qualified mechanic. Incorrectly setting the timing can damage your engine.
In short: Don't guess at a timing number. Use the correct manual for your specific vehicle and follow the instructions precisely.
