Similar question:
I just finished changing my plugs today. Went with Copper Autolite 764's. I had some problems getting them out smoothly because there was some "sand" in the wells! What's up with that. I tried to use a can of air and blow some out with the plug still in there. But when I looked at the threads on the old plugs they had some grit and sand on them. Is theis bad? How bad? How can I fix it? I heard about something called a thread chaser? Would that work? What if some sand gets into a cylinder? an I screwed? I didn't use thread sealer last time (Didn't know) could this cause the problem?
Thanks guys!