Parts Geek - For 1987 GMC V1500 Water Pump Gasket 84211XY. 1987 GMC V1500 5.0L V8. 1987 GMC V1500 5.7L V8. 1987 GMC V1500 4.3L V6. Notes: Engine Water Pump Gasket -- To block. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.