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The crankcase on these cars is supposed to have a slight vacuum.
One reason is the rings are a low tension ring so the slight vacuum helps seal the rings to the cylinder walls.
Crankcase vacuum is tested with a manometer.
There is a spec. for vacuum.
It is measured in "inches of water"
Sorry I don't remember the spec. offhand but it is here somewhere on the forum
Intake vacuum on the other hand is measured in "inches of mercury"
So each test requires its own type gauge.
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