As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER NORMAL TAKEOFF, A BANG WAS HEARD AND THE AIRCRAFT RETURNED TO THE FIELD AND LANDED SAFELY. AN INSPECTION REVEALED A CYLINDER BARREL TO CYLINDER HEAD SEPARATION. ENGINE RETURNED TO FACTORY FOR INSPECTION. NR 2 CYLINDER FAILED. REF: INCIDENT NR BOS99017; EAST COAST AERO CLUB.