1980 Chevrolet Impala Engine: 3.8L V6 GAS;EngineVIN: A; With 70A. Alternator; Position: Fan and Air Conditioning;. 1980 Chevrolet Impala Engine: 5.7L V8 DIESEL; Position: Fan and Air Conditioning;. 1981 Chevrolet Impala Engine: 3.8L V6 GAS;EngineVIN: A; With 70A.