As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON SHORT FINAL, PILOT HEARD AN AUDIBLE BANG WITH ENGINE RUNNING SLIGHTLY ROUGH, MAKING A DIFFERENT NOISE AND NOT DEVELOPING FULL POWER. CONTINUED TO LANDING WITH OUT INCIDENT AND DURING TAXI TO TURN OUT STARTED ACCUMULATING OIL ON WINDSCREEN. REMOVED TOP COWL AND FOUND A LARGE HOLE BELOW OIL FILLER PORT ABOVE NR 4 CYLINDER. NR 4 CONNECTING ROD HAD PENETRATED CASE. ENGINE HAD 1043.7 SINCE FACTORY REBUILT AND 822.2 HRS SINCE A MANDATORY PROP STRIKE TEAR DOWN INSPECTION.