Preheat oven to 350 degrees F. Grease bottom and 1/2 inch up sides of a 9x5-inch loaf pan. In a large bowl stir together the first eight ingredients (through baking soda). Make a well in center of flour mixture.
In a medium bowl combine the next four ingredients (through oil). Add egg mixture and zucchini all at once to flour mixture. Stir just until moistened (batter should be slightly lumpy). Fold in walnuts. Spread batter into prepared loaf pan.
Bake 1 hour or until a thermometer registers 200 degrees F., covering loosely with foil the last 10 minutes if necessary to prevent overbrowning. Cool in pan on a wire rack 10 minutes. Remove; cool completely on wire rack. Wrap and store overnight before slicing.