1. Preheat oven to 350 degrees F (175 degrees C). Grease a 9 inch springform pan.
2. In a medium bowl, mix graham cracker crumbs with melted butter. Press onto bottom of springform pan.
3. In a large bowl, mix cream cheese with sugar until smooth. Blend in milk, and then mix in the eggs one at a time, mixing just enough to incorporate. Mix in sour cream, vanilla and flour until smooth. Pour filling into prepared crust
4. Bake in preheated oven for 1 hour. Turn the oven off, and let cake cool in oven with the door closed for 5 to 6 hours; this prevents cracking. Chill in regfrigerator until serving.