As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE FOUND TO MAKE A WHISTLING SOUND WHEN PROP PULLED THROUGH ON PRE-FLIGHT. INSPECTION FOUND THE NR 3 CYLINDER HEAD CRACKED AFT OF THE INTAKE VALVE. CRACK LENGTH APPROXIMATELY 2 INCHES IN LENGTH. THE CRACK ALSO HAD A SMALL HOLE AT IT'S CENTER APPROXIMATELY .0625 IN DIAMETER.