Once the cover was removed you can see something is obviously wrong here. The rockers weren't even resting on the pushrods. The valve lash must have been out of adjustment so bad that they simply fell to the side. It's not that the valves were too loose but they might have been so tight that the rocker arm assembly bolt might have became loose and backed out. The main bolt on the top of the assembly was very loose and I backed it all the way out to make sure the threads were ok.