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You must have PCV system hooked up otherwise you run the risk of blowing out gaskets and it will always leak oil.
You don't have to have a PCV but it is a good idea for many reasons.
If you don't have a PCV you DO HAVE to HAVE adequate crankcase ventilation though IE: non restrictive breather(s)
All engines develop a certain amount of Blow by. The PCV and or breathers relieve this pressure that would otherwise continue to build up inside the crankcase and eventually begin blowing gaskets seals etc.
If an engine is developing excessive amounts of blowby it is normally due to poor ring seal or a head gasket. A leak down test will establish which of the two is the culprit.
based on your description either your existing breather is very restricted or you have excessive crankcase pressure.
I agree with this as many racers in the older days just used breathers when the cams they used did not pull much vacum and for race engines which are wide open most of the time there is no vacum anyway at wide open throttle so they would use good breathers on their engs and sometimes they used 4 breathers with 2 on each valve cover. I dont use a PCV on the eng in my 63 right now since it does not pull alot of vacum with the cam I use. I use a good breather on each valve cover and it has worked fine for me with this eng. I prefer to use a PCV on a street eng but with a low vacum that big enough cams cause the PCV may not work good. Many racers use the check valves in the header collectors with a hose to the breathers to draw fumes out but on a street car like mine with a full exh system it will not work to well. Course today many serious racers making alot of power use a vacum pump to create a vacum in the crankcase and pick up some extra hp. But I agree that most street engines pull enough vacum and can use a PCV system which they should. You should be able to do like some on here said and find a gromett to fit one of your valve covers to hook a PCV valve in. Ron
Last edited by 383man; 11/28/14 10:59 PM.
