CV-20 lost power while mowing, dropped #1 cylinder. Ran it long enough to get it on the trailer about 2-3 minutes. Found that the intake rocker was loose and turned sideways. Lined everything back up and as I was tightening it down it shoved the valve open with about 3 turns to go. I had earlier checked the position of the the cam, and the valve should not be open, I figured that the lifter had pumped up when the rocker was loosening and would collapse back down but it doesn't. Tried running the engine for maybe 30 seconds and the valve is being held open by the lifter. Nothing bent or broken, checked push rod and its in the lifter properly. Whats going on ?