ORIGINAL: rcdude7
I think the evolution is a chinese knock off of the .46FX, much like the magnum .46XLS, except with a different look.
I would run the engine just slightly richer than normal and fly it. The engine will tell you if it needs a break in if it begins to sag in flight.
There is no copying anywhere on the engine, so it isn't a clone of anything. There is a higher level of quality found in the crankshaft, con rod finishing, and chromed liner. The .46NT is balanced pretty good, but the .40 Alpha is better.
Edit to add: I've broken in 4 or 5 of the .46NTs. Right out of the box, they have a lot of power and run well. I would say that they run with a very slight ragged feeling to it, but really smooth out nicely on the next tank of fuel. I broke one in recently that seemed to run as smoothly as my older NT with lots of time on it. It was a nice surprise on this engine!