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weird noise coming from engine...

Anyone else ever experienced this---

The I5 in my 90 makes a sort of squealing sound, almost like a v-belt 
slipping.  The noise seems to be coming from the general area of the 
upper intake manifold/cam cover.  It's present for about 5 minutes 
or so after cold start-up...

Could this be a worn cam bearing?  Any input will be appreciated.

oh...'88 90 with 105k.  I run 15w-50 synth and change it and the filter 
every 3k.