the cryogenic process causes the molecules to align in a way that makes the object harder, stronger!!
racer brown and oregon both offer lifter tappet referbushing service, like 4 bucks a lifter...
not so on the molecules , it does do something to the metal , and (I cant remember what exactly) but not to the molecules , I did a bunch of researching on it back when I built my 505 , and had the block and mains cryod , and they don't have to heat the stuff after pulling it out of the freezer , they brought it down slowly to actual temps ...
And a machinist cant tell if its been done or not !