Would a properly installed helicoil(for a spark plug) be expected to last the life of the car?
I recently bought a 91 Lumina and while driving to family's house a spark plug blew out. I tried to clean out the threads and put a new plug in but it blew out, so i installed a helicoil in and followed the instructions perfectly. would you expect this
Yes, a properly installed helicoil should last the life of the car, many have. There is another thread repair, named "Time-Serts"
which are better than Helicoils, are harder to find, but are normally permeant fixes. They come with a