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If I replace the stock valve covers, specifically the passenger side which has PCV connections at both ends, with a valve cover that only has a PCV connection at the front towards the throttle body, will I have performance issues, throw any codes, or have issues passing smog (I live in CA)?
If it is not an issue, what is the best way to bypass the connection on the rear of the valve cover? According to this diagram, the connection in question is the dirty side line on the passenger side.
Circled fitting absent from aftermarket (Proform) valve cover.
Last edited by Gunnmetalblue; Jan 7, 2019 at 10:49 AM.
the valve cover you are showing is for later model or LS 6 valley covers !!!! the engine has to breathe so I wouldn't use it unless you convert to the updated valley pan ????
My mechanic said it would be no big deal to either install a fitting on the left side or put a T at the front fitting. My choice would be to install a fitting on the left side. Seems a lot easier than switching the entire PCV system.
My mechanic said it would be no big deal to either install a fitting on the left side or put a T at the front fitting. My choice would be to install a fitting on the left side. Seems a lot easier than switching the entire PCV system.
I agree with your mechanic. You will be fine having only one inlet on the passenger side versus two. If you look at a schematic of the factory configuration, those two connections are T’d together before going through the PCV check valve anyway. I currently have single port valve covers with the “old” style PCV without any issues. I am running a catch can and followed the schematic below. Pretend the catch can isn’t their if you don’t have one and plumb the system accordingly. Notice the second port on the passenger valve cover is “capped”, aka not there.
I agree with your mechanic. You will be fine having only one inlet on the passenger side versus two. If you look at a schematic of the factory configuration, those two connections are T’d together before going through the PCV check valve anyway. I currently have single port valve covers with the “old” style PCV without any issues. I am running a catch can and followed the schematic below. Pretend the catch can isn’t their if you don’t have one and plumb the system accordingly. Notice the second port on the passenger valve cover is “capped”, aka not there.
That would be my new setup, as I have a catch can installed. No worries of throwing any codes?
Hmm, that's a tough one. If memory serves me correctly, I used one run of 3/8" ID rubber fuel line to eliminate any risk of failing adapters/couplers. By doing this, I got rid of that garbage OEM plastic Y-fitting behind the intake manifold that is known to crack. I'd suggest taking a section of tube from your existing system to the local auto parts store so they can match up the correct size.
sorry to bring this back from the dead but this post seemed to have the best diagrams.
being its a pain to get the hose kit for a 97 c5 i just plumbed mine with a PCV from autozone and some different size lines to accommodate the big 7/16 hose that had to go on the one side of the PCV.
but what is that dotted line that goes to the clean side. i don't have that plumbed in
sorry to bring this back from the dead but this post seemed to have the best diagrams.
being its a pain to get the hose kit for a 97 c5 i just plumbed mine with a PCV from autozone and some different size lines to accommodate the big 7/16 hose that had to go on the one side of the PCV.
but what is that dotted line that goes to the clean side. i don't have that plumbed in
Good diagram in your 97 service manual under: Engine - Engine Controls - 5.7L - Schematic and Routing Diagrams - Emission Hose Routing Diagram
PCV system
