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Preheat oven to 325 degrees.
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Butter and flour a 10" tube pan.
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Sprinkle 1/2 cup black walnuts in tube pan and set aside.
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Cream butter and cream cheese, then add sugar beating until light and fluffy.
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Add eggs one at a time, beating well after each addition.
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Add flour and salt, stirring until well combined.
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Stir in vanilla and remaining black walnuts.
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Pour batter into prepared tube pan.
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Bake at 325 degrees for 1 1/2 hours.
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Cool in pan 10 minutes.
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Remove from pan and cool completely on rack.