And here is an article I wrote showing what happened when I deliberately ran a new ABC "too cool" for 45 minutes.
http://www.rcuniverse.com/forum/m_28..._1/key_/tm.htm

Briefly, for those who don't want to read it, after 45 minutes in a full 4 stroke and a head temp down to 145F the piston was as new, the chrome on the liner was beginning to polish, the pinch didn't change and the rod was running in very nicely with no detectable wear.

This was not an attempt to run in the engine, this was an experiment to find out if the myth was true.