Preheat oven to 350°F (175°C).

Combine sugar, oil, and eggs in a large bowl.

Beat well until light and fluffy.

In a separate bowl, combine flour, salt, baking soda, and baking powder.

Gradually add the dry ingredients to the sugar mixture, alternating with buttermilk.

Beat until well combined.

Stir in black walnut flavoring and black walnuts.

Pour batter into a greased and floured loaf pan.

Bake for 45-50 minutes, or until a toothpick inserted into the center comes out clean.

Let cool in the pan for 10 minutes before transferring to a wire rack to cool completely.

Slice and serve.