I think i broke rear main bearing

Newbomb Turk said
You don’t think that was my first repair like that do you?

I’ve been doing this a LONG time and I’ve never EVER had one fail. So if you or your buddy is failing them, take a look in the mirror.

It’s essentially the same repair for spark plug holes. Zero failures there too.

I don’t need luck.
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I've never heard of a heli coils hold in a cylinder head bolt hole not to say that they don't work. We wasn't the one's who installed it it was the machine shop, after the heli coil failure the block was junk. Are you using something other than a heli coil ?