The PCV valve location and the air inlet to the crankcase for the PCV valve supply air needs to be separated. If the crankcase air inlet is going to be the original oil fill tube at the front of the valley cover, then putting the PCV valve at the rear of the valley cover is the logical and simple location for most Y's. Here’s a past link touching on the air flow path for a PCV valve.

http://forums.y-blocksforever.com/FindPost25383.aspx

Performing an advanced search on this site using ‘PCV valve’ and selecting ‘all terms’ will bring up more.

Lorena, Texas (South of Waco)

I hate to point this out but if you will notice a million of "C" brand GM engines their PCV valve was pushed into a rubber gromment in one rocker cover going to a place under the carband the opposite rocker cover had a hose that went to the side of the air filter with a small "brillo" looking filter mounted inside. Others had the hose entering between the carb air filter and the carb. When this all happened the oil filler tube disappeared and an additional sealing twist cap went on the rocker cover for that purpose.

Silly as it may seem filtered air is a must to keep things in working order. How many of you have noticed the automatic choke air tube that goes under the intake manifold enteres in the side of the teapot carb used filtered air? When I change to a Carter WCBB or a Rochester 4GC I make sure the new tube goes into tha carb air filter adapter plate to continue this practice...JD

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

Almost all the GM stuff did the same thing as Drylakes posted. And it did work. Filtered air is a must, you wouldn't really want to dump dirt in the crankcase.

Frank/Rebop

Bristol, In ( by Elkhart) 

Here is a quick video of my PCV setup.



https://www.youtube.com/watch?v=fqgyyF16Go8



I connected two old draft tube "housings" together and put a grommet into one, the grommet holds the PCV valve and that in turn connects to the vacuum port in front of the carb. It's in line with the vacuum wipers, so I have a check valve to keep anything from entering the vacuum wiper pump. The engine draws fresh air in from the oil fill tube.

The GM system described earlier - and the Ford versions of the later era - used clean ventilation intake air pulled through the carburetor air cleaner by the PCV valve. Because the amount of air you would use to PCV ventilate can easily be overpowered by blowby of an older engine - the described intake system allows reverse flow back toward the carburetor. On our older systems this "overflow" would be pushed back out the oil filler tube.

This older picture of the Greenbird shows a "homemade" fitting used with a '64 292 PCV fitted (in the proper check valve direction) with hoses grommets and clamps. It also had to be fitted with an orifice, as its original installation was into a port of the manifold that incorporated small holes into both chambers of the "cross H" manifold.


 
 Steve Metzger       Tucson, Arizona