Agine Yes (if it is an ABC or ABN engine) It is neccessary on the first few starts to get it up to operating temps quickly so the bronze sleeve will expand to a greater degree than the high nitrate alum piston to reach that perfect clearance.

Concerning the thermal cycling. Yes my personal preferance is to introduce many cycles during break in process. It is my belief that the true breakin process occurs during the cycles from ambient temps to operating temps and that will hasten the process over just endless static runs with no cycling.

John