1980-1981 GMC P3500 7.4L V8 VIN: W CARB Naturally Aspirated GAS. 1980-1981 GMC P3500 5.7L V8 VIN: M CARB Naturally Aspirated GAS. 1979-1981 GMC P3500 4.8L 6 Cyl VIN: T CARB Naturally Aspirated GAS. 1979-1980 GMC P3500 5.7L V8 VIN: L CARB Naturally Aspirated GAS.
