I had the Great Planes Extra 300 .40 size that had the cylinder head angled down at about the 8 o' clock position. If this is what you mean, it is so the muffler on a 2-stroke can be positioned at the bottom so it looks better than coming out the side of the cowl. My Decathlon is the same. The engine mount was already attached in the position for this. You are good to go.