I own a 1990 acura teg with the LS non-vtec b18a1, running the vehicle NA, with a coldair intake system dropped through the fender which has to do with my question: on the top left of the valve cover there is a small port that would normally re-circulate back into the intake but on my set up i have applyed a small breather and plugged the hold in the intake so there is nothing from the motor re-circulating minus the vaccum linefrom the intake manifold to the intake coldair tubing.
What could this effect?
What could this cause?
I know it is far more common on a forced induction vehicle, running higher boost levels than average, I was told this could eventully cause harm to the throttle body and intake??? is this true

 

That line is part of your PCV system. The reason you cannot have a line there in a forced induction setup, is because all that pressure going into the valve cover will blow oil around, and not allow blow-by gases to escape the engine.

When hooked up in an N/A setup, it allows fresh air in to "purify" the vapors in the crankcase and allow the blow-by to escape the engine through the PCV.

With an open PCV setup, like you have now, more buildup will probably occur on your piston tops and through the engine. If the system is closed, like it was from the factory, it will not get gummed up as fast.