As far as not using antisieze on spark plugs in alumumin heads wait until you pull the threads out of one due to galling I had that happen on my airplane motor, not good I have been told the most of the new plugs for car applications now come with a anitiseize coating on them I do use it(Graphite type ) on all new plugs and anytime I remove one to look at it and resuse it do not let the graphite get onto the center of the plug, it is a great conductor of electricty, don't ask me how I know that