I may be wrong but from my research the new pins are not technically "pressed in" the rod is heated and expanded until the pins basically slides in with little to no effort. Then when the rod cools it shrinks then it is considered "pressed" into place I don't see how you could damage the piston in this way. Now the rod I could see getting it to hot and and damaging it. From what I understand in a professional setting the rods are control heated to a precise temperature not just freestyling it with a torch. Lol