What was found
FOLLOWING 45 MINUTES OF FLIGHT, ENGINE BECAME ROUGH. CARBURETOR HEAT APPLIED, BUT ROUGHNESS THE SAME. APPLIED FULL POWER AND RETURNED AND ON SHORT FINAL, TOWER REPORTED HEAVY SMOKE. INSPECTION FOUND ENGINE HAD ONLY 3 QUARTS OF OIL LEFT. NR 1 CYLINDER PISTON NICKED AND HEAD CRACKED.