I am rebuilding my 1964 Kadett engine. I can tell it has been rebuilt once before becasue the pistons are ovesize for sure but what to all the numbers mean on top of the pistons? I read in one of the manuals that ther should be 2 sets of numbers, one is what the pistons were and one what the pistons are... What are your thoguhts of these pictures? Are these 73mm pistons or are they 72.99mm pistons in a 73mm cylinder bore? and what about the 0.010 reference?