Yeah -- HeliCoil is a "thread repair".... not a complete drill and re tap.
I've had great success with the several that I've used and keep them "in stock" in the shed for those occasions when they need to be used. Never once had an issue with them.
The problem for most guys ----- he's drilling into the block not just running a drill through a bellhousing hole.... and he won't have a bottoming tap... and access might be an issue etc.
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