Google fasteners and yield strength. The head isn't designed for that level of torque (hell, your rims aren't and they have a beefier cross section) and the fasteners are designed to remain within a certain margin to maintain a specific level of elasticity.... Who told you to just "go ahead"? If it was in a thread on here let me know so I can remove it. If Toyota designed for using torque to yield fasteners (aka TTY) you'd be in real deep shit.
EDIT: On second thought don't Google it, you'll find all the bad info first. Go buy some mechanical engineering texts and start studying.... or read the directions next time (they're not included because the manufacturer is bored).
I posted a little more on this here:
http://www.toyota-supra.info/forums/...ad-gasket.html ...and a lot more on the subject in the past.