On my LT1 I have an AS&M throttle body without the port for the breather tube from the PS valve cover. Can I just plug the hole in the valve cover -- or does there need to be some sort of ventilation?

I will be maintaining the PCV system on the intake.

 

It needs a breather to function properly, or you could just hook up a rubber line behind the maf sensor in the intake duct. Pretty much doing the same thing, but i prefer the breather to keep oil out of the intake.

 

If you plug the ps valve cover, you basically kill the PCV system, as it will get no air. Since you have no air source from the TB, just put a breather on the valve cover.

 

Thanks guys!