Well folks after 40 years the stock Koehler k321 went out, and not exactly in a pretty manor. Finally got time to open it up last night and come to find out I had a blowout in the head. Have a couple of pictures to show ya what in dealing with. Was wondering 1. What everyone’s thoughts were on used heads and 2. If my cylinder wall looks clean enough to go back in with std size piston. Anything helps, thanks!