M/T valve cover question

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Syleng1

Syleng1

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So I am going to use a set of M/T aluminum fined valve covers on a 318.

All of the plug holes are knocked out- One is for the twist in fill cap and one is for a breather. The breather hole is like 1.5” i.d. I believe. Has any one successfully installed a PVC in the breather hole? I am assuming somebody makes a grommet for that purpose. I was told a newer Jeep has a PVC with the grommet for that sized hole already. Not sure. I have plenty of grommets for the breather but nothing that fits a pcv.
Thanks!
Joe
 
Syleng1 said:
So I am going to use a set of M/T aluminum fined valve covers on a 318.

All of the plug holes are knocked out- One is for the twist in fill cap and one is for a breather. The breather hole is like 1.5” i.d. I believe. Has any one successfully installed a PVC in the breather hole? I am assuming somebody makes a grommet for that purpose. I was told a newer Jeep has a PVC with the grommet for that sized hole already. Not sure. I have plenty of grommets for the breather but nothing that fits a pcv.
Thanks!
Joe
Click to expand...

On a side note pay some attention to how flat the cover rails on your heads are.
Sometimes with flat cast covers on stock heads don't like to seal very well due to the rails on the heads being humped up higher in the center.
I second the Autozone suggestion for a grommet, and I have also gotten them from Summit going by the measurements of the opening in the cover.
 
TrailBeast said:
On a side note pay some attention to how flat the cover rails on your heads are.
Sometimes with flat cast covers on stock heads don't like to seal very well due to the rails on the heads being humped up higher in the center.
I second the Autozone suggestion for a grommet, and I have also gotten them from Summit going by the measurements of the opening in the cover.
Click to expand...

I’ll try the Summit route and call tech assist.
Maybe they can shed some light on this subject.
 
One of the other options I thought about last night was making a conversion part that pops into the larger grommet and the pcv sits in almost like the 66 Commando 273 has on the valve cover. - Looks like a small breather but is actually a pcv assembly.

Making it out of an old breather is the start I guess. I was hoping with this thread that somebody out there had used a set of these valve covers and could show me what they did to make them work- besides welding in a piece of aluminum and starting fresh which may be my only option.
Joe
 
There was a thread about these grommets weeks ago. I don't know if I can find it or not.
 
I have 2 sets and I used a Mr. Gasket Gromet package , actually I used 2 grommet packages to make one . I'm thinkin' the PVC hole is 1.240" but I'm confused about which hole I'm thinkin' about . Having a senior moment . But the grommet package will let you install the PVC . Do I make sense ?
 
Apparently the grommets for the Holley M/T valve covers are not currently manufactured. Someone might have old stock.
MVC-331S.jpg
HolleyGrommet241-214.jpg

Holley valve covers, grommets?

PCV grommet | Moparts Question and Answer | Moparts Forums
 
I put in a brand new grommet in my 408 this year, but I don't remember where I bought it. Sorry. Rod

IMG_4666.JPG
 
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