IF it were me, I would be pulling the head to see what is going on inside the engine. How can you tell if the valve is bent or not if you don't have the head off? You need to lay the valve on something flat like a pair of V-blocks and spin it to see what the valve face is doing (large part of the valve). It is possible a collapsed spring could affect it turning over but, I wold not think so.
If you want to mess with it more, without pulling the head, make sure the valve stays open and only turn the engine by hand.
