How many Porsche engines are
in the mechanics shop and sitting around in partial rebuild status? If the mechanic is truly experienced in flat-6 internals, he could have told you all these answers.
It sounds like it is time for a top end rebuild based on all the symptoms of the many problems. . Pull the engine, pull the heads and get them rebuilt. While it is out, redo all the timing chains, AOS, IMS/RMS, water pump and hoses as they are truly old and just removing them is going to be a damaging.
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Prior '70 914, '99 986 Boxster, '01 Boxster S
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