Paccar head gasket permanent repair solution

I am now fully convinced, that Paccar has a problem, with soft counterbores on front and rear cylinders.. I am finding many,many, times, that the #1 and/or #6 counterbores are badly fretted, even though the liner protrusion, is well within spec.(.006"-.0065"). I am told, that when manufacturing compact graphite iron, it requires a very complicated process of heating and cooling. It appears that the front and rear cylinders are not heat treated, correctly. I even had one re-fail, after a very short time, after machining the counterbores to max protrusion. I am now cutting any, badly fretted, front or rear cylinders, for a stainless steel shim. Being, a dissimilar metal, it is less likely to fret, even if it does move, in the block. The one that had re-failed, and now, has a stainless steel shim, has now been working well, for a long time.