There's 1/2" of space between the preglued ring and the end of cow. As RMCCOR7737 mentioned, 1/4" maybe ideal. see pic below.
EF Power 10 will likely cause CG issue. The recommended motor is comparable to Park 480. I'll be interested to find out if/when you decide to install Power 10 motor.
Originally Posted by Raehm
I would really like to buy this plane, but do NOT like the RimFire motor. I'd like to install my EF Power10, but wondering if there is enough room (length) to accommodate it? If not, can the cowl be moved forward?