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ls1 valve cover breathers...suck or push air out?

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Old 06-19-2012, 10:28 PM   #1
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Default ls1 valve cover breathers...suck or push air out?

the breathers on the ls1 valve cover, are they supposed to suck air in or push air out?
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Old 06-20-2012, 08:58 AM   #2
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They suck in, that's why there's a filter so it's fresh but filtered air.

The PCV is what pushes vapors out of the crankcase, or better yet it gets pulled out by the vacuum of the manifold.
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Old 06-20-2012, 02:40 PM   #3
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if you run a properly plumbed PCV system the breather is just hurting you more than anything. properly plumbed means it goes from the valve covers, into a pcv valve, and then to an oil catch can and back to the intake.
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