We helicoil all cyl head bolts on M116 & M117 aluminum blocks.

Notheing like being down to #31 of 32 and heving the threads chese
when you go to final torque.

Had another one pop a head gasket 6 months after valve job--
3 of 16 bolts on that side were not tight anymore.

Lesson learned, for us,anyway.
I'm glad you have had no problem.

__________________
Todd Haven
Parts Manager
MPH Automotive
Houston,TX