If you look at the box that the old SIG Morrissey came in the picture had a 240 that I sold to Maxey Hester. He put it in the Space walker so you could see it. That picture on the spacewalker box was my engine. I had two and sold him one. Most multi cylinder engines have instant throttle response and idle very low.

Have a good friend with TWO 320's on a gruman widgeon.