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I'm going off memory right now, but i think the bentley manual has the vacuum testing specs in it.
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If you could find those numbers, I'd appreciate it.
To the OP, 8 in/hg is too low. You must have a leak somewhere.
All of the vacuum lines come from the back of the plenum under the throttle body. After that, there is 2 gaskets and 1 insulator per cylinder under the intake. I had 3 insulators that were crumbling.