I installed a lightened flywheel + new V8 pressure plate, but got so much chatter that I had to pull the motor again. Ouch. I found heat marks on the pressure plate in one quadrant (the upper on in this picture):
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And using a dial indicator I found that the finger opposite the heat marks stands about 0.030" higher than the other fingers when everything is bolted up tight. It also has a shiny wear mark on it as if it were contacting the throwout bearing more than the other fingers (the RH one in this picture):
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So I am guessing that uneven release of the pressure plate is causing chatter. Here are the fixes I can think of:
1. Return pressure plate for exchange and hope the next one is better
2. Grind off high finger to match others
3. Put shims under the mounting ear under the high finger to match other fingers.
Any thoughts or comments on how to deal with this before I buckle it up again? Thanks!
Giles