Ignition Timing

• ENGINES WITHOUT THERMACTOR NOTE:  Set ignition timing with distributor vacuum line disconnected. Degrees given are BTDC. Minimum allowable setting is 2° BTDC. Maximum allowable setting is 5° BTDC more than recommended figure.
• ENGINES WITH THERMACTOR NOTE:  Set ignition timing with distributor vacuum line disconnected. Degrees given are BTDC.
  CAUTION: DO NOT advance beyond TDC.

If timing advanced beyond TDC, undetectable detonation may occur at high engine speed and damage engine.

Fig 1: Ignition Timing Marks

Courtesy of FORD MOTOR CO.