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    6.9 timing Where did the 8.5* come from

    I have read at several blog sites, "book specification for dynamic timing is 8.5* BTDC". Where is this 8.5 coming from. I have an 85 F250 with ATS turbo I inherited from my dad. 132k original miles. It smokes a lot and was a little difficult to start. I replaced injectors and it ran smoother...
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