You run the pistons backwards, turn them around on the rod......however, that only applies to factory pistons whose pins are offset. The offset pin from the factory was used to help put a "load" on the piston so they would not rattle so much. Turning them around backwards "unloads" them and frees up a little friction and does have benefits. It's an old racer's trick. Modern performance pistons have the pin centered, so there's no need to run them backwards.
