Preheat oven to 325°F (160°C).

Butter and flour an 8 x 4-inch loaf pan to prevent sticking.

In a medium bowl, combine flour and salt.

In a large bowl, beat butter and sugar together until very fluffy, about 5 minutes.

Beat in 1 1/2 teaspoons vanilla.

Add eggs, one at a time, beating well after each addition.

Gradually beat in the flour mixture on low speed until just smooth.

Pour the batter into the prepared loaf pan.

Bake for 1 hour and 10 minutes, or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for 10 minutes before removing it to a wire rack to cool completely.

Prepare the glaze by combining confectioners' sugar and sour cream in a small bowl.

Whisk until smooth.

Drizzle the glaze over the cooled cake.

Let the glaze set before slicing and serving.