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The crankcase, valve cover, dipstick tube are all connected by wide open space. Remember, the oil on the camshaft has to drain back down to the sump. According to the TIS, the vacuum should be between 3-6" of WATER no Hg (mercury) which is the measurement used on a typical vacuum gauge. 3-6" of H2O is not very much. The goal of the CCV as others have stated is to maintain a slight vacuum under all conditions.
 
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