1979 GMC G1500 Engine: 5.7L V8; Water Pump to Block; Composite;. 1980 GMC G1500 Engine: 5.0L V8; Water Pump to Block; Composite;. 1980 GMC G1500 Engine: 5.7L V8; Water Pump to Block; Composite;. 1981 GMC G1500 Engine: 5.0L V8; Water Pump to Block; Composite;.
