Couple of thoughts
1. Drop the sump and check to see if you have debris from the internal timing chain rails. If so, fixing the IMS will be a short term preventative. A failed chain rail will destroy the engine
2. Variocam chain pads are a wear item that can be replaced by taking off the valve covers - no need to open up the engine. The parts are cheap.
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'87 951
'01S 986 (Sold after 16 years ownership)
'78 924 (carburated; sold when moving to CA)
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