i just bought aftermarket valve covers and im deleting my pcv valve or whatever that thing is that goes into the pasenger side valve cover. i was wondering what to do with that open hole, do i stick a valve cover breather in it? do i cap it? and what about the otherside do i stick a breather in that side also?
my freind told me that breathers will make me loose horse powerand that i should use a crank case breather or something.
does anone know what that is? he said you can use the smog pump and hook it up as a crank case vacume

 

I had a valve cover breather for a while...It cut my gas mileage almost in half. I put the stock breather hose back on...gas mileage went back to normal. Something about unmetered air in the system. Sucks cause it sure did look cool.

 

I have one...city I get like 14 MPG running rich in my auto..and got up to 22 on highway. But im also modded, not stock.

 

They're more for an appearance mod than performance. On a lightly modded car it's pointless to have a breather...it offsets the air compression as stated earlier...

 

gee maybe if i take my breather off and put my pcv system back on my car I will get 40 mpg with my h/c/i lt1

The stock PCV system is a good system.

 

first you put down the stock pvc system then ou say it is good. so wich is it

 

i read on www.turbobuick.com along time ago about VC breathers
and the consensus was that on boosted cars they were a good thing and NA cars there is really no gain to be had and in some cases can be "harmful"!?!
i have no real info about it tho and thats the farthest i ever read about them.....

 

listen northern nevada *** the stock system is fine, however for me it wasn't an option. I also wanted the engine bay cleaner, by getting rid of it, there are less lines... I don't think that the breather is hurting me.