As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NEW REBUILT ENGINE PURCHASED FROM CONTINENTAL. 10.6 HOURS AFTER INSTALLATION, NR 4 CYLINDER, NR 2 AND NR 3 CYLINDER MOUNTING STUDS BROKE. NR 5 AND NR 6 MISSING NUTS. (TORQUE WAS CHECKED ON ALL OTHER CYLINDERS AND FOUND OK). SAME ENGINE UPON INSTALLATION REQUIRED THE REPLACMENT OF THE RIGHT MAGNETO AT ZERO HOURS. (X)