They're just regular bolts. Think of the torqueing directions...If it doesn't say torque to x lb ft and then y degrees after you hit the torque values, they are not torque to yield.

AND, although there is a lot of hysteria on this board about TTY bolts, the TTY bolts could probably be reused. You'd have to take a Materials Science course at Big Red to have it explained properly. But basically whatever stress is developed in the yielding would be the new elastic limit for the bolt, until you got noticeable necking down. As I have said many times, my Mercedes engine has TTY rod bolts and the FSM says they can be reused until the necked down portion reaches a minimum diameter. Of course, that was 40 years ago, but steel hasn't changed that much in that time.

What I'd be looking for in any torqueing situation is when you reach the torque value and the head keeps turning with no increase in the amount of pull you are putting on the torque wrench. This is for a non-TTY bolt. Most bolted joints are torqued to between 75 - 85% of yield. What I described above is yield, and if the bolt yields when it isn't supposed to there is a problem with the strength of the bolt either material or heat treat and it needs to be replaced.

And, if the FSM says replace the bolts do it. A set of bolts costs in the same range as a tank of gas. The designers know more than I do about that particular application.

R.