mopar performance valve covers

[justjim]

i have a set of new mopar performance valve covers and i need to know what size hole to drill for the pvc valve

 

[toolmanmike]

i have a set of new mopar performance valve covers and i need to know what size hole to drill for the pvc valve

View attachment 1455530

What size is your grommet?

 

[justjim]

What size is your grommet?

i don’t have one as of now

 

[toolmanmike]

i don’t have one as of now

You need to get the correct one before you start drilling. Al the aluminum covers I ever owned had knock outs. But that was back in the 70's. They might be different now.

 

[justjim]

You need to get the correct one before you start drilling. Al the aluminum covers I ever owned had knock outs. But that was back in the 70's. They might be different now.

i will go to a parts store and hopefully they will have one with a grommet and pvc valve kit ?

 

[lewtot184]

15/16"

 

[justjim]

15/16"

15/16 ??

 

[kiwigtx]

15/16 ??

Get the grommets first before you drill........insurance policy.

 

[lewtot184]

i measured a factory valve cover and it was 15/16". push in breathers use a larger grommet.

 

[justjim]

Get the grommets first before you drill........insurance policy.

 

[justjim]

sale is pending from another member and i will notify him 15/16

 

[lewtot184]

i went thru some of my grommets and there are different options for pcv's and breathers. the 15/16" is for using the factory grommet. there's an aftermarket grommet that fits a 1.18" hole that will accommodate a push in breather and another 1.18" that will fit a gm pcv. the aftermarkets have a smaller o.d. and wider groove for alum covers. i use the aftermarket with a push in breather and gm pcv on one of my cars and it works good.

 

[Grabbergreendream]

I purchased these screw in breathers for my MP covers. They are screw in and incorporate a pcv on one and a breather tube on the other. I got these so I wouldn't have to drill the knockouts.
Chrome Breather & PCV Caps for Mopar Performance Valve Covers Small & Big Block | eBay

 

[toolmanmike]

I purchased these screw in breathers for my MP covers. They are screw in and incorporate a pcv on one and a breather tube on the other. I got these so I wouldn't have to drill the knockouts.
Chrome Breather & PCV Caps for Mopar Performance Valve Covers Small & Big Block | eBay

How do you screw them in without a hole? Confused!

 

[Grabbergreendream]

They screw in the hole for the cap. Scroll to the last pic.
They're made for MP covers so you dont need to modify the covers OOTB.

 

[toolmanmike]

They screw in the hole for the cap. Scroll to the last pic.
They're made for MP covers so you dont need to modify the covers OOTB.

Interesting. I'm not a fan of the look but personal choice there. The knockouts are exactly that. You can pop them out with the ball end of a ball peen hammer.