Thanks for the reply...
I don't know if its the vacuum pump, in my case, the sound seems like it is coming more from the central/rear part of the engine. ...and maybe this is my imagination, but it seems louder on the turbo side. The vacuum pump looked to be in good shape when I had it apart 30k ago.

...fearful in FL...

-Larry

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03/83 300D
07/73 280