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LS1 PCV system to a LS3/7 style....how to route it?????

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Old Jul 10, 2008 | 11:19 PM
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Default LS1 PCV system to a LS3/7 style....how to route it?????

I got the plug for the drivers side valve cover. I also have a catch can, but not sure what to do with the 2 outlets on the passenger valve cover and how to route the catch can.....anyone have a pic or a diagram??
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Old Jul 10, 2008 | 11:48 PM
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Does your engine have the foul air tube coming out the front of the valley cover ?

Like on LS2
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Old Jul 10, 2008 | 11:58 PM
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Fresh filtered air into the valve cover, from either the Throttle body port or from the fresh air tube after the MAF.

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Blank off any outlet ports on the rear of the valve covers.
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Old Jul 11, 2008 | 07:58 AM
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Originally Posted by HSV-GTS-300
Does your engine have the foul air tube coming out the front of the valley cover ?

Like on LS2
yes...
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Old Jul 11, 2008 | 08:00 AM
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Originally Posted by HSV-GTS-300
Fresh filtered air into the valve cover, from either the Throttle body port or from the fresh air tube after the MAF.




Blank off any outlet ports on the rear of the valve covers.
ok...hum. the LS3 TB dosnt have a oullet tube i think...not sure where I woudl get fresh air other than the hole in my K&N filter way up on the rad housing
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Old Jul 11, 2008 | 08:27 AM
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Anywhere between the front of the throttle body blade and the MAF will do.

Ideally it should be air thats been "metered" by the MAF, since that same volume of air ends up in the intake manifold once it has swooped thru the valve covers and valley.

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Old Jul 11, 2008 | 08:41 AM
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ok, thank you
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Old Jul 11, 2008 | 10:12 AM
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Originally Posted by HSV-GTS-300
Fresh filtered air into the valve cover, from either the Throttle body port or from the fresh air tube after the MAF.




Blank off any outlet ports on the rear of the valve covers.



what about PCV valve? and I like that setup, nice and clean/simple, is that valley cover pictured a LS2 on a LS1?
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Old Jul 11, 2008 | 10:43 AM
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Originally Posted by 00pooterSS
what about PCV valve? and I like that setup, nice and clean/simple, is that valley cover pictured a LS2 on a LS1?
No it's probably an LS6 in that pic.
Just about all the engines made after about 2002 do not have an external PCV valve like the LS1 had.

LS2/LS3/LS6/LS7 all have a baffle arrangement under the valley cover and use that instead of an external valve.


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Old Jul 11, 2008 | 01:13 PM
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Originally Posted by HSV-GTS-300
Fresh filtered air into the valve cover, from either the Throttle body port or from the fresh air tube after the MAF.




Blank off any outlet ports on the rear of the valve covers.
what is the hose in the front of the catch that is running straight down?
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Old Jul 11, 2008 | 03:47 PM
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Originally Posted by VGLNTE1
what is the hose in the front of the catch that is running straight down?
Some of them have a sightglass on the outside of the can so you can see how full they are. Down worry about that.
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Old Nov 14, 2010 | 06:36 AM
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Originally Posted by HSV-GTS-300
Some of them have a sightglass on the outside of the can so you can see how full they are. Down worry about that.
Thread mine I know but thanks for the pics will install mine correctly now.
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Old Apr 8, 2011 | 07:42 PM
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What is the point of the catch can instead of the PCV valve like on LS1Howto.com

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Old Apr 13, 2011 | 01:24 AM
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Originally Posted by Grewe02
What is the point of the catch can instead of the PCV valve like on LS1Howto.com
Its to aid in filtering any extra oil that builds up before the air is sent back to the manifold. Not needed on most builds if you are running ls6 valley cover or newer (aka just NOT the stock ls1 setup) but extra added insurance. Most people have the cans prior to updating their valley cover so they keep it there. Hope that helps.
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