Raul wrote
>With this talk of valve adjustments; is it possible with what ever method you
>use to adjust your valves, that they end up being quiet, engine has plenty of
>power, but they do not close on exhaust fully shown by exhaust headers
>glowing a dull orange?

Raul
The dull orange glow can be from bad or old fuel beacause it burns for so long that it is still burning in the exhaust pipe the cat can glow if the engine is full rich or a low or dead cylinder the cat has more fuel to burn off
 I have also seen happen with newly installed engines even with fresh fuel 
new engines run hotter 

>I would think they self adjust, but would trapped air in the lifters cause
>this behavior? [2.1L engine]
Raul 
read the article on my web page that should explain everything  
http://www.bostonengine.com/articles/hydraulicll.htm
Bob Donalds