[iluv69s]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: twertsy</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bergy</div><div class="ubbcode-body">Maybe you could post a picture of the thermal image of an actual block stamp. Metallurgically, I guess that the internal stress could impact the heating/cooling rate very slightly. I don't understand why the thermal unit would pick up a stressed area in the absence of heat change though. Worth a try - show us what you have observed. </div></div>

Sorry Bergy, regarding an image of an actual block stamp, we've never done that, but the same principals logically apply. And frankly, an educated guess tells me the people who fake blocks/stampings aren't nearly as careful/skilled as those we are after... </div></div>


I do not believe there is any welding done on the block re-stamps. They just grind them enough to remove the existing numbers and re-stamp the new machined surface.
Does that machine work to show prior stampings below the grinded surface. I assume the metal molecules are somewhat crushed deeper into the metal when it is stamped..?? I once contacted a 'scientist' about a ZL-1 block who mentioned about 'etching' the metal??