As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT EXPERIENCED A SUDDEN LOSS OF POWER. EMERGENCY LANDING MADE AT MOUNTAIN HOME AIR FORCE BASE. NR 9 CYLINDER HEAD HAD SEPARATED JUST ABOVE THE TOP OF PISTON TRAVEL. FATIGUE FRACTURE APPEARS TO ORIGINATE AT THE EXHAUST VALVE SEAT. 675 SMOH.