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Without some sort of stabilizer on the A/C belt, he's gonna have trouble keeping the belt on the (stock) pulleys, without the A/C engaged, at anything over 7,000 rpm. To keep from destroying perfectly good belts, I would recommend that the belt be removed anytime he knows he'll be turning anything over 7,000. I certainly would never intentionally spin the compressor (engaged) over 6,000. There's just no good reason to do otherwise.
I once rigged up a micro switch and relay that turned off the AC compressor when the throttle was wide open.
, probably the easiest insurance and I've lost a few races over the years because I forgot to turn the AC off
I wouldn't worry about blowing a belt off if everything is aligned and set at the proper tension.