A head bolt hole for the cylinder head on a GM LS engine has damaged threads, the GM approved methods of repairing the damage is to:
Install a helicoil
Use the GM special tool set and install a Timsert thread repair bushing
Use the GM special tool set and install a Keensert thread repair bushing
Weld the hole closed and drill/tap back to the original size
Drill out the damaged threads and thread the hole to the next largest size
Use the GM special tool set and install a Timsert thread repair bushing
(GM has several Essential Tool kits for certain engine families. These kits contain Timeserts and the special drills, taps, installers and fixtures to repair threaded holes in the engine blocks, heads etc.. These kits also work on many other threaded holes and are validated to be as strong or stronger than the original threads.)
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