Balancer is "friction welding"

[C and W Racing]

I don't remember the specifics, but in the National Dragster months back, Rhear Morrison talked about engines and the use of two steps. If I remember correctly ( which is questionalble) it was talking about the damage it causes when using a two step on a burn out. May be worth trying to find the article and read it to see if anything pertains to your situation.
Chuck