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.

 

You need to post some pictures of your set-up.

 

My setup is posted on the first page, the fresh air hose is installed where it is drawn on the picture.

 

Did you try removing the PCV valve you installed into the hose? I've never seen anyone run a PCV valve with a catch can.

 

Doesn't the holly valve cover have a nipple on the driver side as well? Did you cover that or did you run a pvc else where for ir ?

 

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.

 

You want that hose to pull vacuum all the time and the PVC valve will stop it from doing so. Any extra pressure in the crankcase will be pushed into the fresh air (inlet) hose. Once the valve is removed, monitor the catch can closely for oil, because Holley covers push a lot of oil out. You may need to add a fixed orifice to the rear barb to stop it.

 

I do agree it could be the PCV valve, but it might just be because it's the wrong valve and is closing to early. Try it without the PVC valve and see how that works. You might just need to get a orifice/restrictor type PCV valve and then you can just use a drill(if needed) and make the hole larger if its not getting enough flow through it.

 

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?

 

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.

 

several years has past, any final thoughts or updates to this thread?

 

6 years later….be nice to have this information on the first thread that comes up when I search for it