Heli-coil questions

You have to be careful using pipe plugs for "tap adapters" as there are different kinds of pipe threads. They make pipe threads in tapered and non-tapered. If you use a tapered pipe plug tap and go too deep, the hole will be too big and there won't be enough interference to hold the adapter in.

Chrysler generally uses standard straight pipe threads on the holes and tapered pipe thread for the "plug/male" so the taper works like a cork and jams up the straight thread hole with the taper.