Zucchini Bread

5 cups all-purpose flour
1-3/4 teaspoons salt
1-3/4 teaspoons baking soda
1-3/4 teaspoons baking powder
2 tablespoons ground cinnamon
5 eggs
1-2/3 cups vegetable oil
3 cups white sugar
2 tablespoons vanilla extract
3-1/3 cups grated zucchini
1-2/3 cups chopped walnuts

Grease and flour three loaf pans. Preheat oven to 325 degrees F (165 degrees C).
Sift flour, salt, baking powder, soda, and cinnamon together in a bowl.
Beat eggs, oil, vanilla, and sugar together in a large bowl. Add sifted ingredients to the creamed mixture, and beat well. Stir in zucchini and nuts until well combined. Pour batter into prepared pans.
Bake for 40 to 60 minutes, or until tester inserted in the center comes out clean. Cool in pan on rack for 20 minutes. Remove bread from pan, and completely cool.