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As far as the IMS bearing goes:
Well Porsche will not sell you an IMS bearing, it is not in the parts system.. Thgere is no Porsche part to use as a replacement.
An engine can go 225,000 miles with all 24 lifters bad... You'll have loud valve train, but it'll go that far without catastrophe.. BUT you'll be losing .040" valve lift, which is about 10% of the net valve lift of the engine.. That makes for low power, etc, etc...
Its your choice- deny the issues exist and refuse to do a few preventives or listen to what experience has taught us and solve simple issues while they are simple..
BTW- this is a a lot like Breast Cancer or Prostate Cancer... You can feel fine and be dead in a matter of months... If caught early it can be treated..
James was wise... His engine had a terminal illness and was cured with intervention that Porsche didn't develop and said could not be done!
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