Layout of Modified PCV system for LS with Holley valve covers
Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: Dec 2011
Posts: 622
Likes: 0
From: Grand Haven, MI
So an update on this I have put about 1500 miles on this truck this summer in between breaking a bunch of ****. The catch can has not caught a drop of oil, I either have it setup wrong or have not drove it enough to push any oil (which I have a very hard time believing). But the 2 times I have pulled the intake off to fix the engine there has been oil in the intake and the intake runners in the heads so something is not routed right. Anyone have any ideas?
Did you ever hook up the fresh air inlet from the TB to passenger side valve cover?
If you did then you can try locating the CC further away from engine/exhaust heat. this would allow the oil vapors to cool more making condensation of oil into drops more likely.
If you did then you can try locating the CC further away from engine/exhaust heat. this would allow the oil vapors to cool more making condensation of oil into drops more likely.
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: Dec 2011
Posts: 622
Likes: 0
From: Grand Haven, MI
Holley covers have 1 nipple on the rear driver side and one nipple on the front passenger side.
Jontall every thread I have read about installing a catch can they have also used a pcv valve so I assumed you needed it. I received a diagram from another member on a different forum I am gonna try and if it doesn't work I will remove the pcv valve and try that.
Jontall every thread I have read about installing a catch can they have also used a pcv valve so I assumed you needed it. I received a diagram from another member on a different forum I am gonna try and if it doesn't work I will remove the pcv valve and try that.
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
Holley covers have 1 nipple on the rear driver side and one nipple on the front passenger side.
Jontall every thread I have read about installing a catch can they have also used a pcv valve so I assumed you needed it. I received a diagram from another member on a different forum I am gonna try and if it doesn't work I will remove the pcv valve and try that.
Jontall every thread I have read about installing a catch can they have also used a pcv valve so I assumed you needed it. I received a diagram from another member on a different forum I am gonna try and if it doesn't work I will remove the pcv valve and try that.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Holley covers have 1 nipple on the rear driver side and one nipple on the front passenger side.
Jontall every thread I have read about installing a catch can they have also used a pcv valve so I assumed you needed it. I received a diagram from another member on a different forum I am gonna try and if it doesn't work I will remove the pcv valve and try that.
Jontall every thread I have read about installing a catch can they have also used a pcv valve so I assumed you needed it. I received a diagram from another member on a different forum I am gonna try and if it doesn't work I will remove the pcv valve and try that.
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
Also your fresh air inlet is very important. The further away it is from the throttle body, the better it is. I've seen fresh air inlets in throttle bodies that pull vacuum so connect it as close to the MAF sensor as you can. I run speed density so I just have a 3/8" barbed K&N filter on my right valve cover barb.
Thread Starter
TECH Enthusiast
iTrader: (10)
Joined: Dec 2011
Posts: 622
Likes: 0
From: Grand Haven, MI
Also your fresh air inlet is very important. The further away it is from the throttle body, the better it is. I've seen fresh air inlets in throttle bodies that pull vacuum so connect it as close to the MAF sensor as you can. I run speed density so I just have a 3/8" barbed K&N filter on my right valve cover barb.
I am also speed density. I have been thinking about going back to stock valve covers for some time would that be a better set up as far as pcv orfice versus the holley covers?
TECH Fanatic
Joined: Sep 2005
Posts: 1,584
Likes: 23
From: NYC
I put my stock valve covers back on after I was pulling too much oil out of the Holley covers. I have the brand new Holley valve covers in the closet collecting dust and will never use them again. It sucks when you spend money on valve covers and they don't work like the OE covers. In addition, you spend time/money trying to get them to work correctly. If I ever do it again (I'm not), I'd buy the OE LS9 valve covers.
