Thread: pcv or evac:which is better for drawing vaccum?
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Old 01-24-2008, 12:07 AM
  #5  
edvancedengines
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Use both at the same time.

By theory when one is open the other will be closed.

PCV is open only at times of high vacuum. Pcv is closed during full throttle. Crank evac system is mostly closed at high vacuum and is open when at low vacuum.

Ed
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