As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE FAILED IN-FLIGHT WITH LOUD BANG. AIRPLANE FORCE LANDED ON ROAD. INSPECTION REVEALED NR 1 CYLINDER ROD HAD COME LOOSE FROM CRANK AND PUNCHED HOLE IN BOTTOM OF CASE. INSPECTION OF ENGINE FOUND CONNECTING ROD BOLTS, P/N 78027, ON NR 1 AND NR 4 CYLINDERS' CONNECTING RODS HAD BROKEN IN HALF.