Yeah that's the Stoichiometric fuel ratio and I believe the 14.7:1 is what is recommended by Ford, which is the optimum ratio for fuel economy I'm pretty sure. The ratio changes when you are trying to improve performance. N/A combinations are ideally set at about 13:1 and power adders are usually down around 11:1 I think. These are numbers I've gleaned from speaking to other stangers and gearheads at the track and dyno techs and such.
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