I'm mounting mine with the head at 90 degrees to the right. 3 o'clock relative. I have 4 engines to choose from. 40LA, 40FX, 50SX and an FS52S. I have Pitts mufflers for the 2 strokers so it makes sense to me. I'm gonna try the LA 1st. Going for light weight. Hopefully it'll fly this weekend. I'll let ya'll know how it goes.