When did the evo switch over to the 7bolt motor? With the evo4 right? How many evo4's and up have you heard of getting crank walk. I'll give you a hint... as many as you have heard of 1g dsm's getting crank walk. Little to none.

The evo is like any other car if you do not know what you are doing or try to do things cheap you will lose things like reliability and durability.