1988 GMC C2500. 1989 GMC C2500. 1990 GMC C2500. 1991 GMC C2500. 1992 GMC C2500. 1993 GMC C2500 Engine: 4.3L V6 GAS Naturally Aspirated; EngineCode: LB4; EngineVIN: Z; FuelSystem: TBI; Electronic;. 1993 GMC C2500 Engine: 5.7L V8 CNG Naturally Aspirated; EngineVIN: K; FuelSystem: TBI; Electronic;.
