Preheat oven to 350°. Grease a 10x15" baking dish.
Blend the corn and flour together, and set aside.
Whisk together the milk and eggs in a large mixing bowl.
Beat in the butter, sugar, salt and vanilla.
Stir in the corn mixture. Pour the custard into the prepared pan.
Bake for 45-60 min. until the pudding is set and golden.
Cut into squares and serve at once. 8-10 portions.