Preheat the oven to 350 degrees F (175 degrees C). Grease two 9x5-inch loaf pans.

Beat sugar, oil, eggs, and vanilla extract together in a large bowl until smooth; fold in zucchini. Set aside.

Whisk flour, cinnamon, salt, baking soda, nutmeg, baking powder, and cloves together in a separate bowl; gradually stir into sugar mixture until well combined. Fold in walnuts and raisins until incorporated. Divide batter between the prepared loaf pans.

Bake in the preheated oven until a toothpick inserted into centers comes out clean, about 50 minutes.