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I agree that retarded timing is the main cause of over heating . Ford said full advance at speed . I fully retard the spark lever when starting the engine . I run full advance at speed . I feel that anywhere from 35 MPH on up would have been considered speed back in the day . At low speed I retard the spark as necessary to prevent timing knocks and bucking . It should be easy to tell when running too slow for the gear that is being used . Luging the engine at low speed is very bad for the babbit . Slightly retarding the spark at low speeds has worked well for me for the past 60 years .