Throwing pulley/alternator belt

Revoke36 said

Hey guys. I keep throwing the alternator belt when I hit high rpm’s. I have the skinniest v belt I could find but doesn’t matter. The belt is slightly off alignment. I’ve shimmied a few bolts but it’s still slightly out of alignment. Tips please? Hope pics explain it better than I can. Thanks.

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The Boss 302 and Z 28 had deep groove pulleys for just such operation. Those suckers were built to rev.
If you watch the belts with a dial back timing light you can watch the belt at RPM. Possibly an idler from a sepentine system on the back side of the longest free length will damp the whip. Does not need to be in constant contact, just say 1/16" to 1/8" away.