Coat the inside of 2 loaf pans, approximately 8 × 4 inches (20 × 10 cm), with melted butter. Set aside.
Cream the soft butter and granulated sugar together until light and fluffy. Add the eggs and mix to combine.
Sift together the flour, baking soda, baking powder, salt, and spices. Add half of the dry ingredients to the creamed butter mixture. Mix in the pumpkin puree. Mix in the remaining dry ingredients and, last, the pecans. Pour the batter into the prepared pans.
Bake at 350°F(175°C) for about 1 hour or until baked through. Cool in the pans for 10 minutes, then remove and finish cooling on a cake rack.