Ignition Timing

ENGINES WITHOUT THERMACTOR NOTE: Set timing at idle speed with distributor vacuum line disconnected. Degrees given are BTDC. Maximum retard is 2° BTDC. Maximum allowable setting is 5° BTDC more than recommended setting.
ENGINES WITH THERMACTOR NOTE: Set timing at idle speed with distributor vacuum line disconnected. Degrees given are BTDC.
CAUTION: DO NOT advance beyond recommended settings.

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

Fig 1: Ignition Timing Marks

Courtesy of FORD MOTOR CO.

Ignition Timing Specifications