As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF PILOT NOTICED A SHUDDER OR VIBRATION. UPON LANDING ENGINE BEGAN TO RUN ROUGH. MAINTENANCE FOUND LT ENGINE NR 6 CYLINDER HEAD HAD SEPARATED. ENGINE WAS OVERHAULED ON 4-23-2004 AND PUT IN SERVICE ON 5-18-2004. THE ENGINE HAD 475 HOURS SINCE OVERHAUL. THE CYLINDER WAS A NEW, INSTALLED AT OVERHAUL.