[miker98038]

The sealed oil fill cap with the tube out (I’ve not seen one for a PCV valve, doesn’t mean they aren’t out there) is to go to the air cleaner for a “closed” PCV system. I’ve used those.

The oil fill tube for a 69 Z28 has a bung for the PCV and is adaptable to the valley pan at the front. I’ve used those too. But it’s way more work than the grommet, or even the baffle on a stock pan. I like a closed system, it eliminates virtually all the blowby smell from the oil. Which air cleaner you’re using makes that easy or impossible.

Unless your running a high volume/pressure oil pump and winging it past 5000rpm, that grommet should work fine.