2.4 mm is larger then the stock orifice type GM uses.
In my testing I went so far as to reset fuel trims for every test and it is clear by reducing air into the crankcase and venting the fumes that fuel trims were effected.
Depneding on drive style would dictate how open or closed the PCV is and then the effect of air/fumes into the intake to effect fuel trims.

Catch can is a total joke that cyberspace vendors hook people into blowing their money on.
There is no way for a static catch can to cause vapors moving in a horz flow to instantly turn into oil and drop 45 degs down to the can
I have had a catch can on for 5 years and to this day it is still dry.
To make it work there needs to be some pump pulling fumes into the can and then via filter moving what fumes there is back into the heads.

The worry is if that hole is too small and too much pressure in engine a good chance blowing our main seals or other oil leaks.