Ok here we go with this, figure I try to help out as much as I can with everyone else on this board, and now I need help .

Ok I have a built 350 (see specs in sig for details) and I want to hook up a PCV to get the crankcase vented good. I have seen dragsters at the strip with hoses going from the V/C to the collectors on the headers.

My V/C DO NOT have baffles in them, so should I installed them before going on? And the openings are too small to fit a breather (or atleast I haven't found on thats fits).

Right now my headers do not have a provision for fittings to be used, so should I run a hose from the PCV to the intake manifold? Or will this harm the engine because it will be sucking in small amounts of oil?

Or should I cut open and weld a bung in the headers and run the hose to there??

Any info is appreciated guys and gals!!

 

Unless this is an engine that spends most of its time at WOT, put the PCV to manifold vacuum.

 

and you DEFINATELY need baffles in the valve covers on a street engine.

 

https://www.thirdgen.org/forums/tech...?highlight=PCV

 

Why didn't I see that??

But basicall all I need is a baffle and I can run the hose to the intake correct??

 

well, a PCV system is a path for air. Usually one valve cover has the breather (or stock style is comes from your air cleaner), that pulls in air from the outside world, filtered, into your crankcase from one side. The other valve cover has the PCV valve, where the air is pulled out of the crankcase, and pulled into the carb to be burned in the motor.

So if you already have the breather, then yea, just pipe the PCV to the intake (or carb). Or you'll need a breather on the other valve cover, if you don't have one yet.

 

I run un-baffled covers on the street, but like you mentioned, I HIGHLY recommend them. Ive had major issues because of it...pulling oil into the intake, fouling plugs, crudding up ports.... I finally disabled the entire PCV system and ran valvecover breathers. They spray some oil, but my valvecover has a tall fill-tube so it limits what comes out. If it was a standard push-in breather, right off the VC, you'd be screwed I think.

 

Don't use the system that hooks it up to the exhaust... that only works at WOT, and is only for racing. Hook it up to manifold vacuum.

If you have no baffles, you can try what I did. Go get one of those breather caps thats sealed on the bottom, and has a hose fitting on the side of it. Pull out all the foam inside the cap, and open up the 'flap' inside (just use a screwdrive or something to push it open).

Now, install that into your valve cover as you would a normal breather cap. Now, head off to the local parts place, and find an in-line PCV valve that has a hose fittin on one end thats the same size as the fitting on the breather cap, and a fitting on the other end for, IIRC, 3/8" hose. I know they make them, because I have one. Now get the two sizes of hose you will need, put the bigger hose onto the breather cap and the 'fat' side of the PCV valve (make sure its flowing the correct direction before you buy it) and the smaller hose from the PCV to the carb.

If you do it the same way I did, then it works great! Doesn't suck up any oil, and doesn't hang down more than about 1/4" into the valve cover. Its awesome for stock height valve covers with roller rockers.

 

Awesome, thanks the is what I am looking for. THanks for the diagram too!!

 

No prob

 

That actually gave me another idea, which I will post pictures below of.

I used a GM power brake filter (which us designed to keep fluid from going either into the engine or booster) with some 3/8" emissions hose to the PCV. Figure I get the addition of a way to vent crankcase pressure AND a filter to somewhat keep oil out of the engine. I still intend to install baffles, BUT until I can do so I need a way to get the pressure out of the engine and reduce the ill effects of crankcase pressure.

Here are some pics, I hooked it up to the nipple where the brake booster hose would go to, but since I have manual brakes I don't need the hook up.

Pic 1


Pic 2


I apologize for the crappy pics, it was taken on a camera phone. I will get better pics when I can.

BTW it was NAPA part number 675-5136 for the filter.