With tight new engines I usually pre heat the engine with a heat gun to allow the sleeve to expand slightly. b4 the engine has even rotated it is near operating temperature (If you have ever broken In an sts race engine you know this process is imperative)
by traditional I mean run the engine rich, not excessively to the point it nearly flames out and blip the throttle never exceeding half throttle for the 1st 6 tanks, I do the heat cycle b4 that of course. Basically just easy on the rpm initially.
yes, I'm just thinking about the excess stress on the conrod when the engine has a lot of pinch at tdc and is ran at WOT.