1975 Chevrolet P20 Engine: 5.7L V8; 4 Bore Gasket; Open plenum;. 1976 Chevrolet P20 Engine: 5.7L V8; 4 Bore Gasket; Open plenum;. 1976 Chevrolet P20 Engine: 7.4L V8; 4 Bore Gasket; Open plenum;. 1977 Chevrolet P20 Engine: 5.7L V8; 4 Bore Gasket; Open plenum;.
