1964 GMC I1000 Engine: 3.8L L6; 1 Bore Gasket;. 1965 GMC I1000 Engine: 3.8L L6; 1 Bore Gasket;. 1966 GMC I1000 Engine: 4.1L L6; 1 Bore Gasket; Position: Carburetor To Intake Manifold;. 1966 GMC I1000 Engine: 4.1L L6; 1 Bore Gasket; Position: Spacer To Governor;.
