Important Considerations:
* This is a base setting. The actual timing will vary slightly depending on factors like engine temperature, altitude, and the specific condition of the engine.
* You need a timing light to set the timing. You cannot accurately set the timing without one.
* Vacuum advance should be disconnected when setting the base timing. Reconnect it after setting the base timing. The vacuum advance will add additional timing as the engine speed increases.
* Your engine may have modifications. Aftermarket parts, wear, or previous improper adjustments could affect the ideal timing setting. Consult a repair manual specific to your vehicle for the most accurate information.
Always consult a reliable repair manual specific to your 1985 Mustang GT 5.0L HO for the most accurate and detailed timing information and procedure. Incorrect timing can severely damage your engine.
