what size plane can I use evolution 120 engine?

If you're a true beginner bigger than your ready for. A 4 Star 120 or a tiger 120 if you can find one.
If you got some flight time under your belt then those two airplanes will make a good choice

Almost any 120 size plane. Question is, what planes have you been flying up to this point?

Question is what kind or type of plane do you want to fly?

The engine works in any 120 size plane so it's up to you.

I assume you are new or relatively new to RC and the answer to your question is so obvious it has us confused. A .40 size engine works well on a 40 size airplane, a .60 size engine works best on a 60 size plane and a 1.20 size engine is recommended for a 120 size airplane. That is not intended to be a smart ass answer, but it sounds like it its.

Of course sometimes a 120 size engine works great on a 60 size plane.

Let's see.....no reply from the O.P. after 7 days, 2 posts per his bio, and as pointed out an obvious answer to his question. Have we been "trolled"? Just wondering !