1978 GMC K35 Engine: 4.8L L6;. 1978 GMC K35 Engine: 5.7L V8;. 1978 GMC K35 Engine: 6.6L V8;. A/C Evaporator Core. IMPORTANT: To confirm that this part fits your vehicle, enter your vehicles Year, Make, Model, Trim and Engine in the Compatibility Table.
