Catalytic Convertor problems of the 1997 Saturn SC1

While driving on the freeway at approximately 55 mph all of a sudden smoke came from under the hood. Vehicle became squarely. There was a crack in the cylinder head, spilling oil all over the exhaust system, which caused smoke and got oil all over the tires. It blew out 4 quarts of oil very rapidly, causing the front of the vehicle to swirl all over the road. The entire vehicle was filled with oil smoke, making visibility very dangerous. There was a vertical crack on the right side of the cylinder head that went all the way back to the middle of the cylinder head which had nothing to do with the cooling system. It only effected the oil. This defect was next to the air conditioning compressor. The casting did not look like very good quality. It was not reinforced as it should be.