Re: Sounds like a destroyed bearing?
If it is coming from a bad pcv valve just replace it for $25. Twist and pull out. Make sure that the hoses are tight and not cracked. Other than that its tough to say. Could be just about anything. Maybe your valves or rockers are starting to go.... You could just pop the passenger side valve cover and check it out. You could also cut your oil filter open and check for excessive metal shavings.
2006 Limited 5.7, SRT8 Manifolds, 3'' custom walker quietflow system, Crazy Jay Cam, Inertia Performance Heads, Airaid intake tube w/ KN drop in filter, srt8 pushrods, bilsteins, diablo