Strange smoke

I have a question about smoke that comes from the valve cover breather when my engine gets all the way warmed up. It doesnt have any distinct smell and is white-gray. Could it be related to having bad valve guides? Bad valve seals? HELP!!!

most likely blowby. Do a leak down test, you might be replacing some rings.

I have checked my compression, and it is good. The engine is recently rebuilt, it has less than 1500 miles on it. I didnt check the heads extensively for wear though, just a visual.

I guess valve seals