Valve cover is non-vented, except for the PCV tube..................which does have a PCV valve attached at the manifold end.........there is a 90 at the manifold and the PCV valve threads into. THe tube attaches there and goes to the valve cover.

Sorry the pix are so small....I still have the manual, but no scanner frown .
Look closely and you will see.........
Someone else on the boerd did what you say.....except he posted pix of using a "freeze plug" where the road draft goes and put the PCV in the center......I don't remeber what valve cover he used or what type of oil cap/breather cap he had on it.........

If someone reading this is the user I am referring to, please post!
Sorry I can't remember the name :o .


*** GMC ***