The one that you put in the valve cover when you swap to a open air cleaner. What size do I get. I bought one and it was to big for the grommet in vc.
Pretty sure it is 3/4" https://www.summitracing.com/search...breathers/fits-valve-cover-hole-size/0-750-in
If you take the entire valve cover grommet out, part number 62-1490 from K&N is a perfect fit. Been running one for years.
I left the grommet and got a k&n 3/4 and used it. It worked very well. https://www.youtube.com/shorts/uS6we_AdO-0 i have a link to the filters on there if anyone needs some
