As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEAD CRACKED, STARTING FROM THE EXHAUST VALVE SEAT AND TRAVELING UP ABOVE THE SPARK PLUG BOSS AND BACK DOWN APPROXIMATELY ONE INCH FROM THE INTAKE VALVE SEAT. THE ENTIRE LENGTH OF THE CRACK WAS APPROXIMATELY FOUR INCHES. A .1250 INCH BY ONE INCH HOLE HAD OPENED UP NEAR THE EXHAUST SEAT AND SEVERAL FINS HAD PIECES MISSING.