Tubing the gallery with a twist

how would you explain a 100,000 plus mile 440 block that is totally stock in these areas, still having a tight lifter bore w/ new lifters installed 50 yrs later ? all opinions appreciated ------bob

The pictures of the last one I had bushings in went away with the ex wife's computer years ago.
So my response to your question is what are the clearances on those lifter bores?