Ahh I got you know. Thats a good point: Keep the bottom clear. I am going to cut a hole for my glow starter. I have been running it inverted without a cowl (as they are on backorder) for about 2 weeks and it runs fine. People at the field were saying the pitts looked dumb sticking out the side, but when I rotated the engine this morning, it was obvious that the engine head would look worse sticking out a 1/2 inch. I appreciate you thoughts