As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON FINAL THE PILOT NOTICED THE RT ENGINE STARTED TO RUN ROUGH & MAP CLIMB WITH A CHT DECREASE. WHEN THE POWER WAS REDUCED TO IDLE AT LANDING THE ENGINE STOPPED. THE PILOT RESTARTED THE ENGINE & TAXIED IN, BUT NOTICED THE RT ENGINE TO BE RUNNING ROUGH. UPON INSPECTION THE NR 6 CYLINDER EXHAUST VALVE WAS MISSING. DAMAGE TO THE PISTON AND CYLINDER HEAD HAD OCCURRED. THE ENGINE WAS REMOVED FOR OVERHAUL.