As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 10 MINUTES AFTER TAKEOFF A SLIGHT INTERRUPTION OF POWER WAS NOTED WHICH RETURNED IMMEDIATELY TO NORMAL. PRESSURES AND TEMPS INDICATED AN INCREASE IN OIL TEMP AND A DECREASE IN OIL PRESSURE. ENGINE WAS FEATHERED AND RETURNED A/C TO HNL. EXAMINATION OF ENGINE INDICATED NR 7 CYLINDER EXHAUST VALVE HEAD BROKE. SCREENS INDICATED A SMALL AMOUNT OF ALUMINUM.