LS6 Valley cover without a PVC Valve??
Thread Starter
Joined: Apr 2012
Posts: 2,171
Likes: 716
From: Ruckersville, VA
LS6 Valley cover without a PVC Valve?? Hey all,
I'm working through the bugs with my LS swapped 1968 Camaro and I've noticed something strange with some vacuum(not pressure) in the crankcase. After I shut off the car that the engine has a huge puff, where the vacuum is evacuating the motor and while the motor is running it will pull so much vacuum that it's difficult to pull the oil cap off. And if you do pull it off the idle will change a decent amount.
While I was researching what could be wrong, I came across this thread and copied over this post:
https://ls1tech.com/forums/general-m...-up-wrong.html
Does anyone have anymore information on an LS6 valley cover without a PVC? I tested my PVC last night and it has almost no restriction. I picked up the cover at a swap meet and didn't think to check if it was fully functional or not before I installed it. At this point I really don't want to pull the cover, so is there any info on that hose from the valley cover to intake with an inline PVC?
Sorry this isn't a very organized thread, but I wanted to copy this post in the main page.
Thanks,
Ryan
I'm working through the bugs with my LS swapped 1968 Camaro and I've noticed something strange with some vacuum(not pressure) in the crankcase. After I shut off the car that the engine has a huge puff, where the vacuum is evacuating the motor and while the motor is running it will pull so much vacuum that it's difficult to pull the oil cap off. And if you do pull it off the idle will change a decent amount.
While I was researching what could be wrong, I came across this thread and copied over this post:
https://ls1tech.com/forums/general-m...-up-wrong.html
Does anyone have anymore information on an LS6 valley cover without a PVC? I tested my PVC last night and it has almost no restriction. I picked up the cover at a swap meet and didn't think to check if it was fully functional or not before I installed it. At this point I really don't want to pull the cover, so is there any info on that hose from the valley cover to intake with an inline PVC?
some early ported valley plates do not have pcv built into them and still require the external pcv valve. you should verify this since you did not buy the plate yourself.
see this gm image of the valley port and an external pcv valve on some year cars
Attachment 594993
a test would be to remove your oil cap and hook hose to the valley plate, blow into it
if it is extremely difficult to blow into, it has the built in restriction, if it is similar to blowing through the tube itself then you should keep your original valve in-line
see this gm image of the valley port and an external pcv valve on some year cars
Attachment 594993
a test would be to remove your oil cap and hook hose to the valley plate, blow into it
if it is extremely difficult to blow into, it has the built in restriction, if it is similar to blowing through the tube itself then you should keep your original valve in-line
Thanks,
Ryan
TECH Regular
Joined: Oct 2011
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A hose from the throtle body to the pasenger side valve cover barb should cure that , or put a breather where the oil fill is
example https://www.ebay.com/itm/Billet-Alum...oAAOSwYwFbd9Ar
example https://www.ebay.com/itm/Billet-Alum...oAAOSwYwFbd9Ar
Thread Starter
Joined: Apr 2012
Posts: 2,171
Likes: 716
From: Ruckersville, VA
I was under the impression that if I was to vent the valve cover to the atmosphere, I'm essentially introducing unmetered air into my engine which will throw off the MAF's calculations.
Thread Starter
Joined: Apr 2012
Posts: 2,171
Likes: 716
From: Ruckersville, VA
Well, looks like I answered my own question. There is a new and old style LS6 valley cover and I have the old style without a PCV valve. I found a like to LS1howto.com and they have the old style tube with a build in PCV valve listed, but it is very expensive and not sure it's made any longer. I'll probably just end up swapping to the new style for simplicity.