4 bolt valve covers

[billpierce]

I have a set of Early 4 bolt big block moon brand valve covers. That I need a breather and PCV valve for.
The ones I have tried so far are too big around and interfere with the fins.

Any ideas what might fit?

 

[33 IMP]

Have you asked MOON?

 

[billpierce]

I did.
They haven’t made these since the late 50s or early 60s and they have no idea.

 

[junior340]

Breather, Chrome Twist On

maybe?

 

[junior340]

On the pcv side a grommet is what I used on my Mopar Performance finned covers.
Usually really thick but seal well.

 

[zyzzyx]

Max-Wedge 426.

 

[Lefty71]

Go on summit (or jegs, etc) site and search Trans-Dapt grommets. I found some, and some breathers similar to post #4 there for an odd situation like that once. You should be able to find grommets that fit a more modern (70's-80's) pcv valve too.