Separate the eggs. Beat the whites to stiff peaks, and reserve the yolks.
In a large bowl, cream sugar and butter or margarine. Beat in egg yolks. Stir in milk and vanilla. Add flour, 1 cup at a time. Fold in stiffly beaten egg whites. Pour batter into well greased large tube pan.
Bake for 90 minutes at 325 degrees F (165 degrees C).