1979 GMC G2500 Engine: 5.7L V8;FuelSystem: 4BBL; Composite;. 1979 GMC G2500 Engine: 6.6L V8;FuelSystem: 4BBL; Composite;. 1980 GMC G2500 Engine: 5.7L V8;FuelSystem: 4BBL; Composite;. 1981 GMC G2500 Engine: 5.0L V8;Manual Transmission; FuelSystem: 4BBL; Composite;.
