my thinking was that with the liquid it might work its way into the heli-coil and seal it better...but with the aluminum head, and whatever the helicoil and stud are made out of, im pretty sure the expansion rates are just too different for much of anything to seal permanantly....fortunatly it only leaks for a little while during cool down, and not once things are heated up. little smoke as it burns off the mani when i start it, but definatly liveable...maybe try the tape next time.
that seems to be how things go...lol...i dont know if any sealant was used when it was put i or not. the shop that did it is pretty reliable in my opinion, but i didnt look closely to see if they used anything or not. either way, i know for the future, and its not bad enough to cause me any worry...It doesn't happen often but it does seem to happen only in locations a new coil can't be installed without pulling other things apart.
I use Loctite 609. Works good for Helicoils and Thread-serts.When the helicoil was installed it should have been glued into the hole if there is coolant or other substances that could leak. I use a product we get from international I think permatex sells it as well called lock and seal. It is a very thick loctite. I lightly coat the outside of the helicoil before installation and install it. With the way a helicoil is made it will ooze between the coils and onto the installation tool while installing the coil. The tool needs cleaned after installing the helicoil. I then let the stuff dry. If you have time a day or two works well. Then before installing a stud or what ever I run a tap into the hole to scrap any lock and seal off your new threads. Locking in a helicoil will also help if the bolt or stud needs to be removed later to make sure the helicoil doesn't pull out with the bolt. It doesn't happen often but it does seem to happen only in locations a new coil can't be installed without pulling other things apart.