Timing, and a proper fuel mix is key to not blowing a motor when pressing for HP's as you state Justin.... If the bang happens before the piston reaches top dead center then you have pre-detonation and that would ad major stress to the piston, rods, rod studs, crank...Totally going against the rotating action of the motor...That is a big, no no....
E-solver it is clear the early model 1uz-fe's are very stout. Infact, I can't find any early 1uz-fe blown motors, rods, cracked blocks, etc.. Later model 1uz, 2uz, and 3uz's are a different story..
E-solver -To me that's amazing because first off the 92-94 1uz-fe motors have been around much longer and have also experienced more common wear then all the other motors. Infact from what I understand there are more of the those motors out there in the world also... So 650WHP would not suprise me too much on the bottom end, but wow that is alot power on the stock rods, rod studs, and crank... I would assume when you say bottom end you mean the stock pistons have been changed out to forgies... Right? I don't think any xuz-fe stock pistons can handle a true 650whp, if so now that would be a suprise to me...