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My intended use is street and track day driving. I look the look of the ME Wagner PCV but it is quite pricey. I think I might try a standard PCV first. Do you happen to have any part numbers for an LS6 one? I see in an earlier post you mentioned to somebody about removing the orifice in the LS6 valley cover. Is this to create more flow?
Just wanted to check I'm not completely misunderstanding the above, shouldn't the flow go from the inlet pipe to the rocker cover (green line)?
AC Delco part number for the LS6 PCV is 19313320. You will probably need the entire assembly with the boot; the assembly part number with PCV valve is GM part number 12573109.
I'm not aware of a removable orifice in the LS6 valley cover. The LS7 has a fixed orifice in the valley cover.
I did have the arrow and date incorrect on that drawing. Here is the corrected drawing.
Posts 188 and 191 were for a LS2 valley cover which does have fixed orifice PCV valve built in.
Originally Posted by TableLeg
Also, I don't know if it's my browser but I'm seeing alot of references to diagrams but the diagrams aren't showing.
post 70 for example.
I had many diagrams hosted from an old web hosting account that I no longer have. All of those diagrams are missing because the host is gone. It was prior to this site hosting attachments like it does now. If you need a diagram or have a question, post or email; I'm happy to help.
Recently upgraded to LS6 valley cover but it’s the older style one that doesn’t have a PCV built in. With the way my catch can mounts, there’s not much room to put the PCV valve on the catch can inlet and it fits better going between the outlet of the catch can and the intake manifold, is that fine or does it need to be on the inlet?
Cath can rerouting from a track car to street car in my case-please advice
Hello everyone,about a year ago i bought a visually slightly damaged c5 corvette z06 at auction and had it brought to europe where i live. The car had a modified engine (stage 4 cam, forged pistons and connecting rods, etc.), I found this out because the engine had damaged main bearings and I had to check and repair it as well. In my opinion, the car was modified for the track and drifts. Now after a while I put the engine back in the car but after reading this thread I think it needs a redo of the catch can routing. The original catch can that was fitted to the car I believe was a simple can with AN10 fittings with an exhaust on the top that released oil mist whenever the engine was switched off.
I am attaching a quick sketch of how the system was wired in my car and I have marked in red the changes I want to make based on the information I gleaned from this very informative thread. I bought what I believe to be a better quality Moroso chatch can on e-bay long before I found this topic, but now I don't know if it will fit my system as it only has one outlet. It would probably be possible to modify it and add one outlet. I would also like to ask if I can use smaller diameter hoses for the clean air supply (10mm), or will it be better to put AN10 diameter everywhere? I have new LS3 valve covers available. So I can do everything again and better... What is your opinion please? I am grateful for any advice. Thank you.
Recently upgraded to LS6 valley cover but it’s the older style one that doesn’t have a PCV built in. With the way my catch can mounts, there’s not much room to put the PCV valve on the catch can inlet and it fits better going between the outlet of the catch can and the intake manifold, is that fine or does it need to be on the inlet?
for a sealed can on the vacuum side of a pcv system the pcv control can be before or after, but must be there
Originally Posted by odaz
I am attaching a quick sketch of how the system was wired in my car and I have marked in red the changes I want to make based on the information I gleaned from this very informative thread. I bought what I believe to be a better quality Moroso chatch can on e-bay long before I found this topic, but now I don't know if it will fit my system as it only has one outlet. It would probably be possible to modify it and add one outlet. I would also like to ask if I can use smaller diameter hoses for the clean air supply (10mm), or will it be better to put AN10 diameter everywhere? I have new LS3 valve covers available. So I can do everything again and better... What is your opinion please? I am grateful for any advice. Thank you.
you have to use a can that is sealed in vacuum on the vacuum side of the pcv system. if it is not, then you will have a vacuum leak. the hose size is not relevant on this side in most cases, because the flow is regulated down significantly by the pcv control. the free air side of the system needs to be at least stock size in most cases as it is in charge of supporting blowby venting under load
Thanks for the information, this has helped my Catch Can/PCV saga. I basically have the same "situation" as you have pictured here. A mid-engine kit car with an LS1 and with the intake manifold reversed. Routing has been one of my biggest dilemma trying to keep things "clean". Part of my issue is I created a two catch can system that is attached to my firewall (located approximately at the box that says (LSx PCV system"). It's just that the routing "back" to the intake/TB are a long way away, but I'm not sure that a big negative necessarily, other than long hoses.
I like the idea of the ME Wagner adjustable PCV and may try that. That would change the image some (along with my clean side can). So I may connect the LS6 valley cover to the passenger valve cover with a straight shot (or cap both) and try to incorporate the Wagner PCV into the oil fill hole somehow (suggestions??). I certainly can just make holes too. I will add a 2 bar pressure sensor to measure crankcase pressure somewhere to get an ECU reading to help tune the adjustable PCV.
I think I may relocate my clean can toward the TB to avoid restrictions instead of keeping them together as I have them currently. Otherwise I'll tap the bottom of the driver valve cover, closer to the current catch can, but will still have a jog to the TB.
for ls1 valve covers you will need to use a 3/8 adapter (no pcv valve or orifice) if you are going to connect the drivers rear of the valve cover to the air intake/ tb
based on what i see i would just run that passenger rear valve cover port straight to your air intake, much shorter run
then run only the valley to your catch can inlet, much shorter run
then run your can exit via pcv valve to the intake manifold (this can go to the rear vac port on the intake manifold to also make it a shorter run)
the mm pcv cans are self regulating, so it would replace all that you have going on in a single unit
for ls1 valve covers you will need to use a 3/8 adapter (no pcv valve or orifice) if you are going to connect the drivers rear of the valve cover to the air intake/ tb
based on what i see i would just run that passenger rear valve cover port straight to your air intake, much shorter run
then run only the valley to your catch can inlet, much shorter run
then run your can exit via pcv valve to the intake manifold (this can go to the rear vac port on the intake manifold to also make it a shorter run)
the mm pcv cans are self regulating, so it would replace all that you have going on in a single unit
Thanks! I appreciate the feedback. I have a MM CC on my C8 Thumbs up. Since I've made these CC's, I'm going to go with them, but I will move the clean side to near TB.
Currently I have this drivers valve cover. Not sure what kind of adapter you are referring to. I'm guessing 3/8" tubing fits to the TB but this barb is like .40" and too big? I may just pull out the barb and put in a AN fitting somehow. guessing I can find something on that.
yea you cannot connect that to the throttle body side of the system with a sealed can, it has a restrictor built in it specifically for pcv regulation not load handling
Hi, sorry to dig this up, but I found this thread and was trying to look at Aaron's diagrams but they don't load anymore. I was chasing a diagram for an LS1 sealed system without valley outlet running aftermarket valve covers with a single outlet on each (no PCV so will have to run an external one). Did anyone save them and can repost?
Cheers!
Last edited by guyha; Dec 3, 2024 at 04:43 PM.
Reason: Adding more details
Hi, sorry to dig this up, but I found this thread and was trying to look at Aaron's diagrams but they don't load anymore. I was chasing a diagram for an LS1 sealed system without valley outlet running aftermarket valve covers with a single outlet on each (no PCV so will have to run an external one). Did anyone save them and can repost?
Cheers!
Each valve cover should have a 3/8" hose port and on the LS1 stock valve cover the passenger side had two. The passenger rear port connected to the driver side valve cover by way of a T and then connected to the port on the intake manifold but just before entering the intake manifold there was an inline PCV valve. The front port on the passenger valve cover then connected to the throttle body. My guess is that you only have one port on each valve cover so no big deal just connect the driver side to the intake manifold with an inline PCV just before going into intake manifold and connect the other valve cover to the throttle body. If you're wanting to run a sealed catch can not a breather catch can you connect the line coming off the driver side valve cover to the inlet on the catch can and then comin out of the can to the intake manifold with an inline PCV on the line just before entering the intake manifold.
Hi, thanks so much for your detailed reply!
You're correct in assuming I have one outlet on each valve cover. I found this diagram on MM - so you're saying like this just with an inline PCV before entering the intake? Is there any advantage having the PCV there instead of when exiting the drivers side valve cover?
Thanks again for your help!
Originally Posted by 01CamaroSSTx
Each valve cover should have a 3/8" hose port and on the LS1 stock valve cover the passenger side had two. The passenger rear port connected to the driver side valve cover by way of a T and then connected to the port on the intake manifold but just before entering the intake manifold there was an inline PCV valve. The front port on the passenger valve cover then connected to the throttle body. My guess is that you only have one port on each valve cover so no big deal just connect the driver side to the intake manifold with an inline PCV just before going into intake manifold and connect the other valve cover to the throttle body. If you're wanting to run a sealed catch can not a breather catch can you connect the line coming off the driver side valve cover to the inlet on the catch can and then comin out of the can to the intake manifold with an inline PCV on the line just before entering the intake manifold.
your best separation would be having the stock orifice or pcv valve between the valve cover and the can inlet, or using the mm can where the regulation is built in
[QUOTE=guyha;20588205]Hi, thanks so much for your detailed reply!
You're correct in assuming I have one outlet on each valve cover. I found this diagram on MM - so you're saying like this just with an inline PCV before entering the intake? Is there any advantage having the PCV there instead of when exiting the drivers side valve cover?
Thanks again for your help!
Here's a picture of a sealed can setup. You will notice there is an inline PCV valve before entering the top of the catch can. This line most likely connected to the drive side valve cover and the outlet from the can goes straight to the intake manifold. The passenger side valve cover would then connect to the throttle body and then your all set. I personally would want the inline PCV valve to be on the line from the can to the intake manifold but I really do not believe it matters one way or the other but my thinking is the closer the better..
with the newer throttle bodies the connection previously in front of the blade at the top of the tb is simply forward of that but after the maf
we supply a male to male 3/8 barb and a 3/8 grommet
drill hole in soft material push in one end of the barb, push hose on other end of barb
or
drill hole in hard material push in grommet, push in one end of barb etc.
there are also many more expensive ways using bulkhead fittings, etc.
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Cath can rerouting from a track car to street car in my case-please advice 
