Ok, it seems like all the talk is for the 625 studs and noone even talks about the 425. I guess my question would be does anyone know what the stock head bolts are rated for to compare to the 425's?

i know the 625's treated to 260k psi, tirqued to 150 ft/lbs
the 425's are treated to 200k, torqued to 125 ft/lbs
how much stronger are they than stock bolt and what would be possible scenerio for needing either one?