As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BROKEN CYLINDER BASE STUDS AND 7TH STUD WERE FOUND AT NR 3 CYLINDER LOCATION. CRANKCASE STRESS WAS CAUSE OF CRANKSCASE TO CRACK (4 INCH CRACK) AT NR 3 CYLINDER. HIGH MANIFOLD PRESSURE MAY HAVE CONTRIBUTED TO THE CAUSE. ENGINE IS RATED TO 41 INCHES M/P FOR 325 HP RAM SERIES IV ENGINES. (X)