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Preheat oven to 350 degrees.
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Lightly grease two 9x5 inch loaf pans.
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In a large bowl, sift together flour, baking powder, baking soda and salt.
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In another large bowl, beat together the sugar and oil.
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Stir in the eggs, one at a time, beating well after each addition, then stir in the vanilla.
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Blend this mixture into the flour mixture, alternating with the sour cream; stir just enough to combine.
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Fold in the zucchini and nuts, mixing just enough to evenly combine.
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Pour batter into prepared pans.
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Bake in preheated oven for approximately 80 minutes, or until a toothpick inserted in the center of the loaf comes out clean.