Spark Plug keeps loosening up! #6 near firewall

[e30vert]

Spark plug is still not unthreading! Its been a few weeks now. New Plug and Blue Loctite appears to have worked well.

[Dissembler]

Loctite on a spark plug is a bad idea because all spark plus ground through the threads into the cylinder head. Loctite could cause a misfire by increasing resistance on the sparks ground path. However if it is holding your plug in and you are not having any drive-ability issues then more power to you