Grease and flour a 10" bundt pan.  Preheat oven to 350F.

In a large mixing bowl, cream butter and sugar until light and fluffy, about 5 minutes. Add eggs, one at a time, beating well after each addition. Stir in lemon juice, peel and extract. Combine the flour, baking soda and salt; add to the creamed mixture alternately with sour cream. Beat just until combined.

Pour into a greased and floured 10-in. fluted tube pan. Bake at 350 degrees F for 55-60 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack to cool completely.