TwinTurbo.NET: Nissan 300ZX forum - Are you pressurizing them from the threaded end?
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Subject Are you pressurizing them from the threaded end?
     
Posted by LitlElvis on November 20, 2010 at 3:14 PM
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In Reply To PCV valve question posted by zhundred3x on November 20, 2010 at 02:06 PM
     
Message You might hear them leak a bit, they're not a perfect seal, but they won't allow a huge volume of air to pass.

My guess is an older valve has built up carbon and oil in it that conforms to make a better seal.

     
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