The A/F ratio is constantly adjusted by the ECU for engine load, speed, ambient air temp, etc. Yes 10:1 is very rich but its perfectly safe and kind of normal for a factory tune. A well managed aftermarket ECU like a Motec or the new Haltec will be able to keep the A/F in a slightly leaner range and make more power safely. The enemy to a lean A/F ratio is pre detonation, so going too lean is not a good idea.
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