TTY bolts
I found your message interesting as GM originally never listed the crank balancer bolt torque on the 2005 as an torque, then angle turn or a TTY bolt It was just tighten to 278 ft. lbs. I did a little research and found that only on the 2001 and 2002 LB7 has the procedure remained the same. On 2003 and newer it is as you explained. However, the GM shop manual doesn't list the bolt as a TTY until 2011 model year. They are a one time use after that.
That said you will never be wrong replacing it for any year.
Just goes to show when you think you know something, someone asks a question and you find out the game has changed
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