Parts Geek - For 1977-1978 GMC K35 Water Pump Gasket Mahle 99789ZPMH. 1977-1978 GMC K35 5.7L V8. 1977-1978 GMC K35 6.6L V8. Notes: Engine Water Pump Gasket -- Water Pump to Block; Composite. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.
