How to seal up after removing PCV?

I finally went ahead and removed the PCV off from the driver side valve covers.

Now I was thinking of using gasket silicone to seal the cuts or JB weld.

Or even put a rubber with hose clamps?

I'm afraid if JB weld fails and destroys my cams and heads.

How are you venting the valve cover?

Breather tank

I just cut the pieces out and put a plate over the top of it screwed in place sealed with rtv I think. I pull vacuum on that side via intake and modded a coyote catch can in the chain to pull fumes and any blow by. The other side I have normal breather filter.



Crappy picture sorry. I was pulling vacuum on both sides so I have another line going there but i plugged it off and need to rework just been lazy.

I don't get any fumes or oil in the can and I have like $20 for it lol


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so 1 side is connected to intake and other is open via breather?

didnt we discuss you either open it completely and seal the intake, or keep it closed in

Wes06 said:

so 1 side is connected to intake and other is open via breather?

didnt we discuss you either open it completely and seal the intake, or keep it closed in

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Ideally, yes. But Wraith's set up is still better than running a breather on each side with the PCV baffles in tact.

I ended JB welding it. Let it cure off the car for 48hrs made sure it was stuck on for good and put it back in the car.

o2sys said:

I finally went ahead and removed the PCV off from the driver side valve covers.

Now I was thinking of using gasket silicone to seal the cuts or JB weld.

Or even put a rubber with hose clamps?

I'm afraid if JB weld fails and destroys my cams and heads.

Click to expand...

I just folded it back up like in your pic and didn't worry about it. i don't think much oil actually gets splashed up and through the cut.

o2sys said:

Breather tank

Click to expand...

Both sides going to the breather tank?

Wraith said:

I just cut the pieces out and put a plate over the top of it screwed in place sealed with rtv I think. I pull vacuum on that side via intake and modded a coyote catch can in the chain to pull fumes and any blow by. The other side I have normal breather filter.

View attachment 58219

Crappy picture sorry. I was pulling vacuum on both sides so I have another line going there but i plugged it off and need to rework just been lazy.

I don't get any fumes or oil in the can and I have like $20 for it lol


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Click to expand...

You're not getting any oil in the can because you have it set up wrong.

46addict said:

Ideally, yes. But Wraith's set up is still better than running a breather on each side with the PCV baffles in tact.

Click to expand...

How is it better? It's actually worse. When the manifold is under vacuum he is drawing unmetered air into his intake. And when his manifold is under pressure he is bleeding boost into his crankcase.


Why does everybody try and reinvent the wheel? This has been gone over and over and I don't understand how or why we are still confused over it.

Yes both going into the tank. I don't think the passenger cam cover has a pcv built in like the driver side.

o2sys said:

Yes both going into the tank. I don't think the passenger cam cover has a pcv built in like the driver side.

Click to expand...

It doesn't. You're good. Wraith needs to change his set up though.

46addict said:

Ideally, yes. But Wraith's set up is still better than running a breather on each side with the PCV baffles in tact.

Click to expand...

wouldnt that introduce an air-leak though and cause un-metered air into the engine, the whole thing this entire thread adviced against?

One way check valve that doesn't leak boost through only draws vacuum to the can. I will keep mine this way do yours however you like. I wanted a cheap catch can and stock pcv valve leaks so this was my solution. Works fine for me.

Passengers side has no pcv you can just draw via breather


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Nothing wrong with JB Weld at all. It has a very high PSI. Most other epoxies have less than 1/10 the compression strength of JB Weld.

Wraith said:

View attachment 58222

One way check valve that doesn't leak boost through only draws vacuum to the can. I will keep mine this way do yours however you like. I wanted a cheap catch can and stock pcv valve leaks so this was my solution. Works fine for me.

Passengers side has no pcv you can just draw via breather


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Click to expand...

Didn't know you had another pcv in line so that takes care of being under boost. So under vacuum the intake draws air through the check valve. So where does that air come from? It enters through the breather on the passenger side, right? That air drawn through the crankcase and into your intake is unmetered. The engine computer doesn't know it's there because it's unmetered.

The oem drew fresh from after the maf so your theory is correct. The amount must be minimal otherwise the afr would be wack. This was done a while back when I had what I believed to be a blow by issue(oil leak front cover and pan) so I could probably just go back to breather on drivers and cap the intake port and remove the can. Been boosting heavy for 5000 miles with no issues but probably worth plugging off and venting now to be safe


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Wraith said:

The oem drew fresh from after the maf so your theory is correct. The amount must be minimal otherwise the afr would be wack. This was done a while back when I had what I believed to be a blow by issue(oil leak front cover and pan) so I could probably just go back to breather on drivers and cap the intake port and remove the can. Been boosting heavy for 5000 miles with no issues but probably worth plugging off and venting now to be safe


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Click to expand...

Yeah, it was only probably drawing any air at low load and rpm so your motor is leaning out anyways. No harm no foul. Me, I would just ditch the can anyways. I don't get much if any drippage running 3 breathers. I do change them out every once in a while though. They will get gunked up from the inside over time.

^Are your PCV baffles removed? Wondering if this is a mandatory thing with breathers or if it's a precaution. I suppose the second best option to having an oil separator is to leave the stock setup alone and clean out the oil residue in the intake every now and then.

46addict said:

^Are your PCV baffles removed? Wondering if this is a mandatory thing with breathers or if it's a precaution. I suppose the second best option to having an oil separator is to leave the stock setup alone and clean out the oil residue in the intake every now and then.

Click to expand...

Yep. And I run a 710 cap breather too. If you are going to run breathers you should remove the valve from the cam cover. If you don't, you only have the one outlet and it does get messy.




Running a stock system or a closed system with a catch can still will introduce unwanted stuff into your cylinders.

The only real downside to running breathers is that you have to change your oil out more often. My car rarely gets past 3K miles between changes. I actually tend to do them every 2500 because it keeps the mileage numbers easier to track.

o2sys said:

I ended JB welding it. Let it cure off the car for 48hrs made sure it was stuck on for good and put it back in the car.

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Which jb weld did u use on it?

The regular one:
http://www.jbweld.com/collections/all/products/j-b-weld-twin-tube