Welcome › Forums › Mechanical Systems & Maintenance › Engines › Smoothie – Engine Upgrade › Reply To: Smoothie – Engine Upgrade May 7, 2022 at 6:16 pm #4576 CJKeymaster Now for the sump. Started with this. Ended with this. Made this from a piece of solid aluminum rod. This is the return fitting and will be welded to the top of the tank. . Still needs tapping.