[massey478]

Top of heads looks normal. I would replace all of the push rods. Definitely do the hammer check of valve movement. On valves with no bent push rods try it, not hitting them like you were driving a nail but hard enough to make the valve 'pop'. Do not hit the keeper edge, just squarely on top of the valve. If it is stuck it either will not go down and pop back up with the same force it took to do it on a good one or will go down a bit and not return as it should. With rocker arms off look for any valves that are sitting at a lower height than others. If they are stuck bad enough, in the open position their height from the top of the spring to the head will be shorter than others.