1970 Buick Sportwagon Engine: 5.7L V8;EngineCode: SO; 2 Bore Gasket; Individual throttle bores;. 1971 Buick Sportwagon Engine: 5.7L V8;EngineCode: TC; 2 Bore Gasket; Individual throttle bores;. 1971 Buick Sportwagon Engine: 5.7L V8;EngineCode: TO; 2 Bore Gasket; Individual throttle bores;.