Preheat oven to 350°F (175°C).

Grease and flour a Bundt or tube pan.

In a large bowl, mix together flour, soda, salt, sugar, and cinnamon.

Add oil and eggs to the dry ingredients and mix until well combined.

Stir in mashed bananas and nuts.

Pour batter into the prepared pan.

Bake for 1 hour, or until a wooden skewer inserted into the center comes out clean.

Check cake at 45 minutes and cover with foil if browning too quickly.

Let cool in the pan for 10-15 minutes before inverting onto a wire rack to cool completely.