Valve Cover Breathers-What is NHRA acceptable?

I have to add some breathers to valve covers. Are the old standard rubber grommet push-in style Valve cover breathers acceptable by NHRA Tech guys? I thought they were not. I took a quick look at the NHRA rule book and did not see anything about valve cover breathers. What are you guys using?

What ET are you planning on... I believe sub 10.0
they wanted locked on ones

never seen them check them so unless you are at a division or national event don't worry

NHRA Super Street-IHRA Hot Rod 10.90. I think the car will be able to run about a sec quicker. I would like to go to some divisional events.

I would not suggest just a push in breather, you need something in addition to the grommet to keep it in there.

I went with the bolt on,I have blown the push on type off a few times