1. Remove PAL PS2 game from US PS2.
2. Insert PAL PS2 game into PAL PS2.
3. Enjoy.
pretty much this .. but the thing is why would u want to play pal games on the USA console.. pal is 17.5% slower than NTSC unless optimised for pal and even then the image may appear distorted
I can only remember gamecube and dreamcast games having the option to run either at 50hz or 60hz and now too current gen consoles but not for ps2 unless it was in the software...
you could also try modding your ps2 to make it region free