Preheat oven to 350 degrees. Cream sugar and margarine until very creamy. Add egg yolks one at a time, beating well after each addition. Sift flour three times. Add soda to sour cream; stir well. Add flour and cream alternately to the sugar-margarine mixture. Blend well. Add "ADAMS BEST" VANILLA, ADAMS ALMOND EXTRACT, ADAMS BUTTER FLAVOR AND ADAMS LEMON EXTRACT. Beat egg whites until stiff, then fold into mixture. Pour into well greased, lightly floured stem pan (or loaf pan). Bake at 350 degrees for about 1 1/2 hours, or until toothpick inserted into center comes out clean.