1979-1986, 1988-1995 GMC K3500 5.7L V8. 1979-1986, 1988-1990 GMC K3500 7.4L V8. 1979-1986 GMC K3500 4.8L 6 Cyl. 1979-1980 GMC K3500 6.6L V8. Larger opening for increased coolant flow. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.
