I have a biplane Pheaton II from Balsa Usa. I have a Magnun 65 engine which is a little bit bigger than recomended (Recomended .40 to .60). The engine fits a bit too hight from the cowling (almost imposible to put cowling).

My question is: What would happen if I bring the engine mount about 3/4 or 1/2 an inch down?

Would it have any effect on the performance of the plane?
Would it fly? What would it do?

Thank you,

Paul