1977 GMC P25 4.8L 6 Cyl. 1977 GMC P25 5.7L V8. 1978 GMC P25 4.8L 6 Cyl. 1978 GMC P25 5.7L V8. Notes: Radiator Cap -- Standard; 16 lb. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.
