Stoich is 14.7 and thats what the PCM tries to keep the car at. At the top of the rpm's you should be NO higher the 11.7 as that is optimal. 12 is a bit too lean unless your running alky / meth... You can do damage if your in the 12's or above.
Running too rich can also cause damage as well. 9.8 is Really rich, and your losing HP that way.




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