1979 GMC G3500 Engine: 5.7L V8; Water Pump to Block; Composite;. 1979 GMC G3500 Engine: 6.6L V8; Water Pump to Block; Composite;. 1980 GMC G3500 Engine: 5.7L V8; Water Pump to Block; Composite;. 1981 GMC G3500 Engine: 5.7L V8; Water Pump to Block; Composite;.
