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Old 03-31-2016, 10:28 AM   #1
aod92
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Breather question?

The breather hole that's on the rear driver side cover. Did you guy run a breather here or a pcv valve to your intake? Is either way better?
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Old 03-31-2016, 06:58 PM   #2
72MARIO
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Re: Breather question?

I am curious what to do with this as well.

the 2003 4.8 I got originally to use in the Suburban had a tube with no valve at all in it. Then I decided to get a 6.0 its a 2002 and it has what looks like a pcv but no valve inside.
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Old 03-31-2016, 07:54 PM   #3
dayj1
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Re: Breather question?

Quote:
Originally Posted by aod92 View Post
The breather hole that's on the rear driver side cover. Did you guy run a breather here or a pcv valve to your intake? Is either way better?
Early motors have an actual PCV valve. GM later revised the valve to a fixed orifice design where it still looks like a PCV valve but has a tiny hole in the base with nothing inside. Then, the later models just have a nipple pressed in the valve cover with the fixed orifice inside the cover. In other words, a fixed orifice system that doesn't have a removable/serviceable "valve".

So, the answer is that it's part of the PCV system. If you have a later engine with a hose nipple on the valve cover, run a hose to a vacuum source. If you have a hole in the cover, you need the fixed orifice "valve" and then just run a hose from the valve to a vacuum source.
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