What was found
CYLINDER HEAD FOUND CRACKED FROM INJECTOR BOSS TO THE UPPER PLUG HOLE. AFTER INSPECTION OF ALL CYLINDERS ON BOTH ENGINES 5 OTHER OF THE ORIGINAL CYLINDERS INSTALLED AT O/H WERE FOUND CRACKED. ALL CRACKS WERE EITHER FROM THE INJECTOR BOSS TO THE UPPER PLUG HOLE OR EXHAUST VALVE TO UPPER PLUG HOLE. BOTH ENGINES WERE O/H AT THE SAME TIME AND THE CYLINDERS HAD THE SAME AMOUNT OF TIME ON THEM. NO METALLURGICAL ANALYSIS WAS PERFORMED AND NO CAUSE COULD BE DETERMINED. ALL CYLINDERS WERE SENT BACK TO THE MFG. (K)