I asked & you answered, thanks.. actually I'm running somewhat the same setup, only my intake oil cap is a std large filtered Autolite cap & also with a PCV setup. It has been suggested here that the filtering of that cap may be marginal, but I don't  drive the car in bad conditions (dust etc). So, I'm going with it as is.. So far it seems to be working well. 
N.B.- late correction;  I described the above cap as being an Autolite..the labels off it, but I believe that should have read "Motorcraft".


Paul

Being an open faced filter I'm assuming at speed it could cause air to be forced into the crankcase. Other than that I just liked it better than the one without it. The shield only blocks the front of the filter the rest is open. I am also running a PCV valve and no lower crankcase breather.



Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Hey Moonshadow;  Obviously I'm missing something here.. Why would you want to prevent air going into the filtered oil cap ?  Does your engine have another source for crankcase ventilation?.. Or ?


Paul

 
The 4280 worked. No clearance issues.

I've been using a cap like this one on my Vicky for years. I like the shield that prevents airflow from entering the tube. They are available from most of the regular makers. I think I bought mine off the wall at O'reillys.




Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

Remember the old saying; "Chrome won't  get ya home"!

"FREE SAMPLE"

I've ordered the Spectre #4280. I will keep you posted if that works. 

Doesn't John recommend a certain cap for his valley covers?  I have one of his covers and thought I got my cap based on his recommendation.  Here it is
                                                         

Manufacturer	Source	Part number	Hose fitting?	Finish
Mr Gasket	Jegs	720-2060	No
CP		70150	No
Stant		10061	No	Cad
Stant		10070	Yes	Cad
Spectre		4280	No	Chrome

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

I also have one of johns valley cover the problem I am having is the filler tube is slightly larger than the stock  
one having a hard time finding a breather that fits any info would be helpful thanks 

If you have to go to a small cap.. keep in mind that on a stock engine, that is the only air intake for the crankcase breather setup. The filter material needs to be checked & serviced regularly or it will plug up & the engines crankcase breather setup will not work..leading to slugg buildup etc.   


Paul