http://i87.photobucket.com/albums/k157/tomtyres/calc.jpg
http://i87.photobucket.com/albums/k157/tomtyres/calc.jpg
Thats probably fine mate,
My "chav" valve usually gets an oily residue around the outlet holes!
Just excess crank breather oil (probably/hopefully?) :)
I have NGK-R's with 15psi of boost and no probs at-all!