ORIGINAL: 46u

I have tried many break in methods and all seem OK but the one where you idle tanks of fuel throw them like HPI recommends. Yes just about as soon as you start it up run it. All so while breaking in while letting the engine cool down make sure you have the piston at bottom dead center (BDC). If you have a temperature gun here is another heat cycle method.
http://www.rbmods.net/enginetempering.php
SIM2U method sounds good as well.