What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) While in cruise flight, PIC experienced vibration, followed by engine roughness. Vibration/roughness was apparently severe enough to convince PIC that total failure was imminent. PIC declared emergency, and landed at first available airport. Nose gear collapsed on landing. PIC stated that landing was harder than usual, but not so hard as to cause gear failure. After landing, PIC reported that two cylinders had "blown". Engine had just come from major overhaul, and had between 5 and 6 hours since completion of that overhaul.
As the FAA filed it
(-23) WHILE IN CRUISE FLIGHT, PIC EXPERIENCED VIBRATION, FOLLOWED BY ENGINE ROUGHNESS. VIBRATION/ROUGHNESS WAS APPARENTLY SEVERE ENOUGH TO CONVINCE PIC THAT TOTAL FAILURE WAS IMMINENT. PIC DECLARED EMERGENCY, AND LANDED AT FIRST AVAILABLE AIRPORT. NOSE GEAR COLLAPSED ON LANDING. PIC STATED THAT LANDING WAS HARDER THAN USUAL, BUT NOT SO HARD AS TO CAUSE GEAR FAILURE. AFTER LANDING, PIC REPORTED THAT TWO CYLINDERS HAD "BLOWN". ENGINE HAD JUST COME FROM MAJOR OVERHAUL, AND HAD BETWEEN 5 AND 6 HOURS SINCE COMPLETION OF THAT OVERHAUL.