ORIGINAL: JB COMP
I'm done using the heat cycle method and run 5min instead of the 2-3min
You need the engine temp at least 210 to start breaking it in. You can run your engine almost as hot as you want as long as you're not lean.
I do the same, I'll le the engine temps get up to 250-260 as long as I have good smoke. After 5 minutes I shut her down and put the piston at BDC and let it cool then repeat.
Ideling through the first couple of tanks and not letting the engine temps to get above 210-220 degrees will put stress on the con-rod and may reduce the engines logevity.