As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ROUTINE FLIGHT PILOT HEARD A BANG AND ENGINE LOST POWER BUT CONTINUED TO RUN. UNABLE TO MAINTAIN ALTITUDE, PILOT MADE AN OFF AIRPORT LANDING. FOUND NR 1 EXHAUST PUSHROD BENT, WORN AND BROKEN. REMOVED ALL CYLINDERS AND FOUND NR 1 CYLINDER INTAKE PUSHROD BENT SLIGHTLY AND NR 5 CYLINDER EXHAUST PUSHROD BENT SEVERELY. SUSPECT PUSHRODS WERE BENT BY BINDING OF THE VALVES. THIS ENGINE WAS REMANUFACTURED 11/18/99 USING NEW CYLINDERS.