Mustang 428 Cobra Jet Tune-Up Specifications

Ignition Timing
(Vacuum advance disconnected, lines plugged)
6° BTDC
Dwell Angle 30-33°
Point Gap .020"
Spark Plug Gap .035"
Idle RPM*
(Manual Transmission, no A/C)
725
Idle RPM*
(Manual Transmission, with A/C)
725/500**
Idle RPM*
(Automatic Transmission, no A/C)
675
Idle RPM*
(Automatic Transmission, with A/C)
675/500**
Firing Order 1-5-4-2-6-3-7-8

* Set idle speed with headlights on high beam, air conditioning off.

** Higher RPM, solenoid energized. Lower RPM, solenoid de-energized.


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