Your worst nightmare-
I'd rather trade 10 blown head gaskets for 1 stripped out bolt threads. This is the 4th helicoil I had to install into this head. I'd rather have had to do the head gasket 40 times over.
And this happened NOT from overtorqueing, I have a DIGITAL torque wrench that displays LIVE real time torque values 5 times a second. This is to prove that Toyota aluminum is weak and will strip out from normal torque values.