I recently had this discussion with the local Porsche indie mechanic. He told me that the higher mileage cars he had seen with blown engines were the results of chain ramp/tensioner failure; IMS bearings were holding up fine.
Sounds like it comes down to maintenance and that the ramps & tensioners needed to be addressed around 120K.
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Rennzenn
Jfro@rennzenn.com
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