The sad part is our classic mopars could never have achieved this kind milage because of leaded fuel, non-hardened valve seats high tension rings, and improvements in oils.
They kind of did with the Magnum engines that's why you find them in the junkyard with 200k miles and still crosshatch on the bores. Sequential port EFI, better oils, better machining, tighter tolerances, lighter weight components, but it's still just a modified LA small block at the end of the day. So they last forever if you take care of them; similar case for other 1990s "modernized" pushrod engines like the Ford 302/351 and Chevy 350. The architecture was designed for much harsher operating conditions than engines have to deal with today.
Those Japanese engines run forever because they have exceptionally tight tolerances, consistently high-quality materials and super precise machining and metallurgy. And Toyotas make no power from the factory so they last extra long :rofl:
