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Rear vavle cover vent plug

Started by Beaverseagle, December 20, 2015, 01:28:16 PM

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Beaverseagle

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.
82 SX4 258 w/ 2 inch lift 235 tires and TBI kit.

amcfool1

#1
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

eaglefreek

#2
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
1986 AMC Eagle Wagon 4.2L/4.0L head, AW4,NP242, Chrysler 8.25" rear.
1981 AMC Eagle Wagon As Seen On TV  Lost In Transmission




"I know he'd be a poorer man, if he never saw an eagle fly,
Rocky mountain high"  John Denver
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carnuck

#3
January 06, 2016, 01:53:40 AM Last Edit: January 06, 2016, 01:54:39 AM by carnuck
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.
AMC/Jeep gauges are for amusement only. Any correlation between them and reality is purely coincidental!
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