Ignition Timing

Set timing at idle speed with distributor vacuum line disconnected.

Ignition Timing Specifications

Engine

⁽¹⁾ Emission

Non-Emission

289", 302"

6° BTDC

390" Except GT

6° BTDC

10° BTDC

6° BTDC

12° BTDC

427"

6° BTDC

12° BTDC

428"

6° BTDC

10° BTDC

429"

6° BTDC

⁽¹⁾	Exhaust Emission (Thermactor or IMCO) is used on all U.S. cars.

Fig 1: V8 Engines Ignition Timing Marks

Courtesy of FORD MOTOR CO.