alluminum v/c holes

[rattler]

have a pair of aluminum valve covers that have a 1 inch id hole that pcv and breather gromets won't fit anyone know what is used in these holes both have the twist in oil filler caps also thanks

 

[GTX JOHN]

I do not run PCV valves on the race cars. I tap the
extra holes and plug them. I run just a single breather on
each cover. If you have more blow by than those can handle it
is time for a engine rebuild.

 

[Cal Tonsley]

I’m assuming these are MP covers, if so, I used a Scott Drake twist in rubber grommet for my PCV
Scott Drake C7AZ-6892 Scott Drake Valve Cover Grommets | Summit Racing

 

[rattler]

yes these are mp v/c thanks for your input

 

[CRUZE 418]

Mancini Racing has them too.

 

[rattler]

thanks