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It's the pilot bearing binding under load. Go retighten the bell housing bolts to make sure you have limited the chance that caused it. Any change in the relationship between the bellhousing and the block can cause this to happen. In your case it was brough on by extreme rpm's. This is a common problem.
If you didn't use an actual bearing as opposed to a bushing you may have wanted to. Certainly you lubed the hole with a quality grease and packed a bit in behind the bushing you used. (it's ok most people don't either) It will either happen again or it won't. It may be having it happen will have loosened it up, or it may make it worse. The fix will be a new pilot bearing.
Good Luck,
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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