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A couple of thoughts. Was the piston pin and it's retainers intact? A popped snap ring and a moved pin can cause all sorts of destruction. Also, did the shop who built the bottom end use a stretch gauge on the rod bolts? Perfectly clean parts, ARP's special lube, and tightening with a stretch gauge help to get just the right stretch on the bolts. Another thing: I'm not reading too much into the failed pressure plate other than its a strange coincidence. I've seen two different pressure plate diaphragm springs fail, and both were in grocery getters. One a Toyota and the other a Chevy. Remember, the diaphragm is bending all the time, so a metallurgical fault can easily create a crack. I cant see how high revs would create a crack in the diaphragm. A crack in the flywheel or friction area of the pressure plate is where I would expect to see damage from high revs or excess slippage.
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