Try not to confuse the vacuum source with where the inlet for the PCV gasses originate.  The PCV valve can be at either end of that line and be effective.  The valley cover with the rear baffle is always a great choice for a PCV valve air source and my druthers are to put the PCV valve at the cover rather than at the vacuum source.  But it doesn’t matter where the vacuum is sourced as long as it’s close to the carburetor.  Using the port at the rear of the intake manifold that was originally used for the vacuum wipers is not a suitable location for the vacuum source as it’s too far from the carburetor and tends to lean out the rear cylinders.
  

Lorena, Texas (South of Waco)

If you look at the ILL's I posted, FORD had two FYB system designs, one for a two-barrel carburetor application and the other for a four barrel carburetor application.

The 4V (4BBL) design sources the vacuum signal at the intake manifold carb plenum so that ingested vapors can be distributed somewhat evenly among the cylinders. The 2V (2 BBL) design has the vacuum source on two intake manifold runners, which will overload those cylinders with vapors and possibly disturb air/fuel mixture on those particular cylinders.

You have to understand how the system works before any modification(s).

BASIC THEORY - https://auto.howstuffworks.com/positive-crankcase-ventilation-system.htm

To have an effective system 2V system (IMO), one would NEED TO emulate ... ??? ... the 4V system with a carb spacer w/ vacuum inlet nipple. And yes, it was a 'BETTER DESIGN".

I cannot understand why no one has not written a detailed TECH ARTICLE to hopefully explain what is going on rather than endless  discussions, varying opinions  and arguments.

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Gotcha...thanks gents.  I had read about the intake vs. carb vacuum source.  I think my Holley has a vacuum source at front and back that I can use.  

I used the Moroso Baffled Grommet on mine. 4 Years works fine. No excessive Oil usage. You can use that with the existing Valley Cover. Just use a Hole Saw to cut proper size Hole. I used the correct Grommet that fits PCV and Super Glued it inside the Moroso Grommet.

  

oldcarmark, what PCV valve did you use?  

Here's what I ended up finding.  Thanks to a guy on the HAMB...

Looks like some kind of metal repair was made to where you now see the Rivet Nut but it's solid...
I had a few questions...
1.  The scrubby metal thing that's stuck inside the square baffle part...do I need to do something to keep that captive?  It doesn't SEEM like it would come out but it doesn't seem like it would be good if it did.  I could run a few self tapping screws along the edge and make a "cage," if I need to...Does it even need to be in there?
2.  I have seen the other thread about which PCV Valve to use...why not the stock one?  Looks like it screws right in, maybe an O ring to seal it, instead of the gasket?
3.  If I decide to use a grommet and a different style PCV, then should I run a bolt into that Rivet Nut?
4.  What needs to be cut/trimmed so that the heads do not need to be removed to get this off...at a later date?

Mine has nothing and came from a1964 pickup. I’ve never found oil in the lines or the PVC valve.
That looks like something my mom used to scrub pots and pans with in the 40-60’s. 

56 Vic, B'Ville 200 MPH Club Member, So Cal.

  

This is really not going to do anything (IMO) and you would have to remove the valley cover on a regular basis to service/replace it.

And what if it fell out and landed in the lifter valley? The concept is correct but executed incorrectly (again - IMO).



1961 - 1962 FYB PASS CAR 292 2V INSTALL -

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OK, let's try it this way -

You are not going to know how much blow-by/crankcase pressure is going to be drawn into the combustion chamber(s) unless it is excessive and carbons the plugs/piston crowns. Simple as that. You would need a BLOW-BY METER or AOS SYSTEM to know the extent of the ingestion.


I stumbled across a post describing fabricating an adapter for the valley cover -

MR. Ted Eaton had fashioned this as an alternative to the OEM separator -





I guess the intent was to use the valve grommet with the slit in the bottom. This will still allow vapors through the system and will hinder vacuum draw from the crankcase (IMO).

Now a separator is needed. Both BLUE THUNDER and MUMMERT includes a mesh strainer on their alum valley covers.

My thought is to modify the fabricated spacer to accept the strainer as used on the 5.0/5.8L EFI lower intake setups -





This strainer would slide into the adapter and could easily be serviced. The PCV VALVE would mount atop as in the OEM EFI setup. The only problem I could see if it would possibly interfere with the ECZ-9425-B intake with the vacuum port at the rear of the intake runners. This idea is in lieu (Fr.) of the OEM separator (which I personally would prefer but that is not neither here nor there).

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