piston damage (new pictures)

[billfish]

Thanks for all the advice, I will drop pan and remove piston next week and report back to you with the results and pictures. In reinstalling the valves I'm having a problem pulling the intake valve guides down to install the horseshoe clip. The rubber seal around the guide is the problem, even with the proper pry bar they won't budge, any tricks I could try. Maybe i'll start a new thread.