I didn't have any clearance issues at all on my 2013.I know this is a super old thread but recently I purchased 2011 valve covers for my 2013. Question for anyone: the 2011 valve covers fit the 2013 engine no problem, the steering knuckle seems to be in the way though. Has anyone done this swap and was there anything extra had to be done to make them fit and not hit the steering knuckle? Was the engine in this pictured raptor lowered any to accommodate for the taller valve covers? Thanks in advance to all who respond.