Dr1, Thank you. Yes I'm aware of the fact that the plane, & the engine don't care what angle the engine is sitting at. It's just that this particular model doesn't have a completely smooth flat firewall. It has those two vertical pieces of triangle stock on each side about a half inch in from the side preventing the engine mount from rotating at 360 degreees. You get sideways, upright, or inverted. At most any other angle than those three, the engine mount hits those rails. They are actually two pieces of hardwood ply coming out through the firewall with triangle stock glued up against both sides of them. I don't want to mess with the structural integrity of the plane so I'll be leaving those two pieces in tact. I don't do the photoshop thing like MinnFlyer, or I could draw ya a picture.

Thanks guys, I'll get er squared away today.