+1 on the bdc while heating the engine. The only time I wouldn't want the piston bdc is if you were taking off the back plate. Keep in the practice of moving your piston to bdc whenever possible to avoid forgetting to do and ruining a motor after you left the piston at the top after a run. Always check after you run. It's a routine you need to follow, one for breaking in, the other for taking the motor apart since they are the opposites.