Hey guys,

I know this topic has been beaten to death, but this one is a little different than most. I am trying to do the simplest/cleanest catch can routing on my NA lq4 with a tbss intake, stock throttle body, and holley valve covers. The holley valve covers are adapter covers to be able to run SBC covers over the top of them, so each side has a nipple to run fuel hose for the pcv system. However, these covers do not have a pcv valve built into them like stock ls1 covers do. They recommend you run a Beck Arnley inline PCV valve (which I bought), but they do not tell you the best place to put it or any other instruction. I've also read in some other forums that people do away with this valve and instead run some sort of orifice with a hole drilled in it?

Additionally, I am running a custom valley cover to match the valve covers, so the LS6 style valley cover is not an option as far as the pcv setup goes. Would anyone be able to draw up or explain a simple way to run the pcv with a catch can? I'm using a ws6 store aluminum can. Again, I've seen many people run it different ways and I am not finding any consistent answer, especially when using the Holley covers. I'm really trying to do this with the least amount of hose exposed/cleanest way possible.

Thanks in advance

 

Any reason this routing wouldn't work? Seems like a simple effective setup.

 

Bump... anyone got any takes on this?

 

It'll be fine. That's the stock setup, and the catch can is in the correct line. Of course you can locate the can anywhere convenient, just have it between the driver's valve cover and the vacuum side of the throttle. Just as a reminder, the other port in the diagram going to the passenger valve cover, is filtered air not under vacuum.

 

Ok, so I got around to running the pcv lines and adding in the in-line pcv valve. I still need to run the short hose from the catch can to the intake (after the throttle body) and I am a little confused on which port should be used for this. On the intake, it looks like there are at least 2 or 3 ports not currently being used and I'm not sure what to do with them/which one to use for this last hose. Hoping you all can point me in the right direction. In the first pic, there is a plugged port on the back of the intake (I assume for a brake booster) circled in blue. Could this be used for a vacuum source rather than right behind the throttle body?

In the second pic, circled in red, I believe is evap? I won't have an evap setup on this engine, so should I just plug this (and if so, how)?

Circled in green is another port that I believe went to the driver's side valve cover. Is this the port I should be utilizing off the catch can? I plan to shave the intake, so ideally I would like to use the port at the back of the intake that is plugged, or I would like to relocate this port to somewhere hidden...

Circled in yellow is what seems to be another plugged port. Any ideas?

Thanks