I removed the valve cover and listened to each one individually and there was no noticable noise. I then noticed the air tube over the drivers valve cover is real noisy. Can these go bad & how do i seal it if possible or are they cheap to replace?

 

You might take a look at this mod, it might help you out.
http://riptide63.homestead.com/restrictor.html
I never hooked up my AIR system after my header install, so i'm not totally sure about your problem.