DO NOT preheat oven. Grease a 10-cup or larger bundt or tube pan with solid vegetable shortening. Set aside.
In a large mixing bowl, cream together the butter and cream cheese until light and fluffy.
Add in sugar and salt. Mix well.
Mix in eggs and vanilla. Beat until fluffy, about 1 minute.
Mix in flour a cup at a time. Beat until just combined. Do not overmix.
Pour cake batter into prepared pan and even out with a spatula.
Start in a cold oven and bake at 275 degrees F for 2 hours.
Cake is done when a wooden skewer inserted into the middle comes out with a few moist crumbs.