The Japanese invented (first to implement anyhow) the hard chrome rings trick. That's what turned 100k mile engines into 250k. The world copied them about a decade after (mid to late 80s). Once consumers saw how long Hondas and Toyotas were going on the original engines.
I wouldn't be at all surprised to find that GM, Ford, Mercedes, VW etc had sat on that for decades. Liking the service income.
My dad remembers the annual valve job and 40k rings and bearings. Yeah metallurgy.
American cars truly did suck in the 80s, beyond the sloppy body fits which were just longstanding crap standards. The only computer controlled carb worth a shit came from Japan. Thank dog we've settled into EFI. EPA rules and carbs made for absolute shit engines, from everyone.
When my friends and I rebuilt the engines in our first cars (VW bug), we always put in new piston-cylinders with forged pistons and chrome rings. Those engines lasted 350K miles and more. And this was in the early 1980's. So that technology is very tried and tested.
Nothing recedes like success. -- Walter Winchell