@dhomuth nailed it. I've driven tens of thousands of miles in multiple Corvairs and have yet to throw a fan belt. The items he lays out are correct. Most folks want to pull the belts tighter to prevent them from flipping or throwing, but in fact slightly loose is best. Should be able to turn the alternator (or generator, I like early models too!) with one finger. To folks used to single-plane accessory drives, this will be insanely loose, but that's the ticket. If you still have problems, I recommend making sure your pulleys run true and are nice and clean.
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