Yes, Porsche changed to the rubber centered clutch discs on the 3.3 Turbos. They tend to work fine on relatively stock cars, but once the modification bug bites, they don't hold up to the increased power for too long. Age also plays a big factor in their failure.
The good news is, you can swap a rubber centered disc for a 3.0 liter 930 spring centered disc without any modifications.
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Brian
1981 930
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