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so i have a 75 camaro with lq4 6.0. s475 turbo, holley single plane intake with the poweradder fitech throttle body. motor has factory valve covers. has a ls6 valley cover. How should i set up the PCV system?
ok thank you for your input. it is much appreciated. The only thing that concerns me is pulling vacuum through the valley cover and venting the valve covers makes the motor run like it has a moderate vacuum leak. I guess there is no way around that?
I orig used the LS6 valley breather, it sucked oil into the intake-I switched it to the valve cover, added an oil separator, and a ck valve, and a filter where the oil cap was.
ok thank you for your input. it is much appreciated. The only thing that concerns me is pulling vacuum through the valley cover and venting the valve covers makes the motor run like it has a moderate vacuum leak. I guess there is no way around that?
with a PCV valve it shouldnt be real bad. you may need to re-adjust your IAC steps and throttle valve screw/TPS
matt mentions he gets 40-60 steps with a cammed motor....i guess my cams a little bigger since the best i get is about 80 steps with the TB jacked so far the screw is just dangling by a thread lol
When I switched my PCV system, it thru the idle off a little (Holley HP).
Since I man. tune it below 1500, the map sensor was reading in a diff area, so I just changed it so it was happy.
I have a LY6 6.0. I removed the metal barb in each valve cover, threaded each hole to 1/4 mnpt, ran 3/8 hose to the sides of a vented catch can. I also drilled a hole in the valley cover and threaded it to 3/8 mnpt. Ran 1/2" hose to the bottom of the same catch can. On the top of catch can is a small 2.5" air filter. This works great and any oil that's pushed into the can drains back into the engine when it's not running. Yes my can is higher than the valley cover. This is also on an airboat where my cruz in rpm is constantly 2800 to 3000. Has been working perfectly so far with not a hint of oil out the filter.
il filter
ok thank you for your input. it is much appreciated. The only thing that concerns me is pulling vacuum through the valley cover and venting the valve covers makes the motor run like it has a moderate vacuum leak. I guess there is no way around that?
The way around that is to draw air from your intake tube post-MAF. Your throttle body may have a barb provision for a PCV hose. If you're looking at the throttle plate, it's at the top left. Run that to the pass side valve cover and that's your fresh air inlet. I put a metal 3/8" check valve on that line to make sure nothing gets burped back into the throttle body. Then, the LS6 valley cover outlet gets routed into a can, the output of the can goes to the intake post-throttle body.
If it's done the way Budracing says you will be applying boost to the valve cover via the port on the throttle body and it venting out through the valley cover. That would not be a desirable or correct way. Either vented to atmosphere or all sealed with pcv would be correct. On anything boosted I always use vented.
If it's done the way Budracing says you will be applying boost to the valve cover via the port on the throttle body and it venting out through the valley cover. That would not be a desirable or correct way. Either vented to atmosphere or all sealed with pcv would be correct. On anything boosted I always use vented.
Sorry, halfway through the responses I forgot this was for a turbo application. #Monday
In a turbo setup I'd definitely be running a draft can.
I will stick with my vent to atmosphere method and zero chances of oil in the intake.
More than one way to skin a cat obviously, its all preference and I don't think there is a right or wrong way to do it. Vent to atmosphere less complicated way to do it and it works.
I haven't had a single issue doing it this way with over 1300rwhp to the tires.
Thanks for the reply's guys it helped me alot. Yes it is easy to over complicate ha. This is my first ls turbo build so its been a learning curve for me. I've always been a N/A big block guy but i wanted to try this build since everyone is doing it and making crazy power. im not gonna push it too hard since it is a stock shortblock with gapped rings. cammotion stage 1 turbo cam. ported 317s and ported holley single plane. id be happy with 500-600 rwhp. hopefully it will spool decent. running up and forward turbo headers with 2.25in. tubing divided all the way to the turbo. And lots of heat wrap.
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PCV setup on lq4 
