Exhaust manifold bolt holes stripped

[Rawze]

To me, that does not look like the proper X-750 style heli-coil designed for exhaust manifolds, etc.
- Genuine heli-coils are ex$$$ for a reason ... so Someone should also be aware that chineesium fakes are NOT the right material or quality, so buyer beware.

It also does not look like its inserted far enough. Also How deep are those threads vs. the bolt width?.

just my thoughts.