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Author Topic: Rear vavle cover vent plug  (Read 3159 times)

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Offline Beaverseagle

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Rear vavle cover vent plug
« on: December 20, 2015, 01:28:16 PM »
Hello All,

I just finished upgrading to an aluminum valve cover. Is there anything wrong with plugging the rear vent of the valve cover or does it need to be remain open? I don't want to create any leaks in the new gasket and cover.
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Offline amcfool1

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Re: Rear vavle cover vent plug
« Reply #1 on: December 20, 2015, 03:57:18 PM »
hi, you need to run a line from that rear hole to your air cleaner breather filter, like stock. Do NOT plug that hole, it's how your engine breathes, along with the PCV in front. good luck, gz
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Offline eaglefreek

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Re: Rear vavle cover vent plug
« Reply #2 on: December 20, 2015, 06:52:03 PM »
One hole is fresh air in and the other is blowby out.  https://www.youtube.com/watch?v=EPIfI9aZHt4
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1986 AMC Eagle Wagon 4.2L/4.0L head, AW4,NP242, Chrysler 8.25" rear.
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Offline carnuck

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Re: Rear vavle cover vent plug
« Reply #3 on: January 06, 2016, 01:53:40 AM »
PCV takes the dirty air out and the other port lets fresh air in (unless you go EFI, then the PCV port becomes a CCV) If you only have one, you will either overpower the PCV and oil will be forced out the gaskets and/or blow the rear main seal or there will be too much suction and oil will be sucked out past the rings.
« Last Edit: January 06, 2016, 01:54:39 AM by carnuck »
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