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What is the ideal air/fuel ratio? I've heard figures like 10 parts air, 1 part gas. Is this correct? What is the air/fuel ratio given off by a completely stock engine?

 
Rep Power: 424

14.7:1 is complete combustion (everything is expended). You dont want to run that high under load, as you want some factor of safety set into the system, NA, I think you could get away with High 12s at WOT, under boost, you want mid 11s

 
Rep Power: 232

So complete combustion is 14.7 parts air and 1 part gas. But idealy, you want 12 parts air and 1 part gas at WOT (wide open throttle)?

 
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For boost or NA?

 
Rep Power: 232

Both

 
Rep Power: 350

12 anything :1 is uber rich. You won't make power that rich. I'd say mid-high 13's would be good under n/a apps. Mid-low 11's is ideal for boost, gives a good cushion of safety.

 
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12's:1 on an N/A all motor app should be fine. That will allow for some buffer of bad gas and top end runs.