I sorta hate to add another PCV question! There are plenty of threads and I reckon I've read most of them but can't quite find the answer.
I have an ACE finned valley cover to put on my 312 with a grommet and valve to suit. The cover comes with a PCV provision - a circular flat area ready to be machined out and 2 posts on the underside which presumably could be drilled and tapped to screw on a baffle (not sure I would be comfortable with the possibility of dropping a screw).
What configuration should the baffle be? I imagine something like Mummert's maybe, but I can't see a decent photo of his. Is it sealed on just 2 sides, allowing airflow in through the outer 2 edges? Or is another design better? And what about the large vertical baffle that the stock cover comes with? I gather it's not particularly necessary?
(It's interesting that they put a baffle below the filler though)
Thanks, Mark

See if these help.
FoMoCo 1958-1964 valley cover
  

Mummert valley cover with PCV valve


Mummert valley cover without PCV valve


Blue Thunder valley cover with PCV valve

Lorena, Texas (South of Waco)

Kingfisher, I have the same Ace valley cover. Ace told me that they don't install a baffle due to various lengths of pcv valves. I would think if you Loctite the screws or use high-temp epoxy, whatever baffle you use should be secure. I've also considered removing the sheet metal baffle from my original valley cover and tack-welding it to the Ace valley cover. Let me know what you come up with, including photo, and what pcv valve you're using.

Thanks.

You could install the sheet metal cover from a stock cover with screws and then spot weld the screws to the cover so they couldn't work loose.



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

Thanks Ted, very helpful. What's the welded nut for on the Mummert baffle?

I don't have an original that I can steal the baffle from, but I can certainly bend something similar. And then a couple of screws and spot welds will work I reckon. Thanks all, I'll post a photo when done.

A factory breather pipe or pcv adapter attaches via that nut.  You can see a similar item on the factory cover baffle in Ted's picture - that one is spot welded.



Lawrenceville, GA

I bought a PCV on ebay that fitted perfectly. It's almost like ACE designed their product to suit. 
https://order.ebay.com.au/ord/show?itemId=403582260806&transactionId=1151754649027&mkpid=0&emsid=e11401.m1842.l5919&mkcid=7&ch=osgood&euid=d1ae85d206cd400084961a67e1356152&bu=43765525669&exe=0&ext=0&osub=-1~1&crd=20230513193326&segname=11401#/
I then bent a piece of stainless roughly similar to the original and secured the bolts with some RTV. It's a bit rough to look at, but should work I guess.

That looks like a pcv valve for my '88 Firebird.
Ace probably designed it to work with the stock parts, which so happens to be sized such that a pcv grommet does work.



Lawrenceville, GA

Kingfisher, do you have a part# for the pcv valve? I hope there is some space between the bottom of the valve and the baffle. 

The pcv sits almost flush with the bottom of the cover so there is about 1/2 inch between pcv and the baffle.