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  #901  
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Dangit, I got lost somewhere.....
I see from slack tube testing that the pressure can be manipulated.
Just not sure where you're going.
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  #902  
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not going any where, just a little think & see
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Just a brief note on spiral pinion gears?
The 45 & UL use exactly the same breather timing method as appears above (thanks again) except the distances from the pinion gear to the gasket surface are different.
The other spiral gears are 6 spline (all "small" 4-cam engines have 4 splines): the 1939-53 OHV big twin oil pump drive which turns CW, and the 1937-48 UL return pump drive which turns CCW. No worries, you can't get the wrong one on, but be careful with basket cases and swap meets.
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I got to be honest, I've never studied auto PCVs that much.
I've always known the flow path... and how to remove the intake air from the A/C..
But I believe I have an old one to cut open...

I made this drawing for posterity of my SBC general breathing path.
It does require vacuum to operate properly but as I mentioned, positive pressure will find it's way out with the vacuum removed.
So it's not definitely not sealed.

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the spring in most pcv valves are there only to prevent cross ventilation when the engine is down. this can cause condensation as the engine cools.
while vac does pull it up, if the pressure rises too far or as rpm increases and exceeds capacity, the c/c vent backs to the air cleaner.
soooo, if your filter gets oily, sign that the system is max'd out, aka, not working.
as a side note: the books used to say shake the valve and if it rattles, it's ok.
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At one point or another, I was trying to stop the oil from going into my A/C.
I realized the oil was going the wrong way and was trying to see if there was debris on the bottom of the PCV that may be obstructing the flow.
Sucking on the inlet told me there wasn't.
Shaking the PCV revealed that it was sufficient according to the book.
Then I came to realize after several vehicles doing the same thing that blowby as it gets older will always increase.
This causes the oil flow to reverse and land in the A/C anyway like you said.
I'm always saying that I'm usually the last owner of everything I own anyway.
I'll drive it til it drops.
So I just started cutting to the chase and removing the line to A/C from the getgo.
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Still pretty much stands if it rattles, it's ok. Just check my dad's today in fact.
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