Heat oven to 350℉ and generously grease (with butter) and flour a 12 cup capacity bundt pan.
In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, ginger, allspice, cloves, and nutmeg until thoroughly combined.
In a separate large bowl, beat together the butter and sugar until the mixture is light and fluffy, about 3 minutes. Then beat in the eggs, one at a time, ensuring that each one is fully incorporated before adding the next (about 30 seconds per egg). Add the pumpkin, sour cream, and vanilla extract, beating until well combined.
Add the flour mixture to the pumpkin mixture. Using a silicone spatula, fold in the dry ingredients until the batter is well combined, scraping the bottom and sides of the bowl until no traces of flour remain (being careful not to overmix).
Spoon the batter into the prepared pan, smooth the top, and then firmly tap the pan on the countertop a couple times (to release any large air bubbles).
Bake 55 to 60 minutes, or until a cake tester or wooden skewer inserted into the cake comes out clean. Allow the cake to cool in the pan for at least 20 minutes. Then invert onto a wire rack and allow the cake to cool completely before glazing.