Kammala wannan jumla: Ferrari ta fara kakar wasa ta 1991 da babban fata na lashe gasar. Jean Alesi ya sanya hannu kan kwangila tare da Scuderia lokacin da Nigel Mansell ya koma ƙungiyar Williams. Sakamakon mafi kyau na 642 shine matsayi na biyu da Alain Prost ya dauka a 1991 United States Grand Prix, wanda aka gudanar a titin titin Phoenix. An maye gurbin 642 da Ferrari 643 a cikin
1991 Gasar Faransa.