I am currently running a PCV valve on my 355 in my Z.It is a non cc 355,Weiand Stealth,Speed Demon 750 DP,Comp Xtreme 274 cam,SLP 1 3/4" headers,no cat,Flowmaster cat back,yada yada yada,you know the rest.My question is should I lose the PCV valve and just run a breather on each side of the motor,or leave it how I have it now,one breather on passenger side and PCV valve on driver side hooked up to port on carb?What are the pros and cons of running it versus not running it?Not worried about emissions being as this is the only emissions type device left on the car.Thanks for any and all help.

 

If you want to keep the PCV, you could always figure out some way to route it to the exhaust.. I think I've seen a couple of parts in Jegs which is just a breather with a tube which has a hose which will connect to the bung in the exhaust. That way you can maintain the effectiveness of the PCV without risk of contaminating the fuel mixture.

Az.

 

You're better off keeping it. The PCV system prevents blowby gasses from contaminating the oil, forming acids which whill shorten the life of the engine. Even old cars without PCV used a road draft tube which used the slipstream under the car to draw gasses out of the crankcase.

 

Definatley run the Pcv, I think running it to the exhaust is a good idea also. I didn't want to run it on my 383, but the two breathers wouldn't work quite right. It will dillute your air fuel mixture, but this is easy to compensate for.

 

PCV always annoyed me...and I don't run it. Even the smallest vacuum leak can make tuning a pita, and there are millions of motors out there that live just great for a very long time with just breathers.

There are kits for running it to the exaust, and I think thats a great idea. If I didn't have the turbos..I would have gone that route. Does take some welding to fab in however, and I've only actually seen them on long tubes.

 

I T off the vac line to the PCV Valve and run a second PCV Valve in the other valve cover and no breathers. And benefits or bad things about this setup?

R

 

WS6, you need a way for the air to enter the crankcase, the pcv vacuum line sucks it out and the breather lets it in. If you drive on the street at all, run the PCV system.

 

I thought there was some benefit to having full vaccum in the crank case. Something about better ring seal or some deal like that.

R

 

there is, but manifold vacuum doesn't do the job. It needs to maintain 12-14" of vacuum at higher rpms, and you need an oil seperator w/return.

 

So basicly all I get from dual PCVs is that cool whistling sound as vac bleeds off when I shut the engine off =(

R