I got to 9,500.
Keep in mind that I set my power jet to be on the edge of too rich down in Phoenix at 1,500 feet. If I crank it a quarter or a half richer, it will burble. That's the way I like it. Those who jet crisper likely won't have any issues, I suspect. Same with my metering rod. I have it set such that it is so rich that I need to crank in the idle screw all the way in to get it to idle to my liking. Me having to crank in the idle screw indicates a rich condition which requires the slide to be raised to let more air in.
Anyway, I started at 7k up in Flagstaff and after a warm up I found the metering rod to be handling everything nicely. No change needed. The Power Jet was burbling at WOT, so I cranked it 3/4 turn leaner to rid the problem. I never touched it again, even when I climbed to 9,500 and temps rose from 70F to 85F.
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