My CSVT puked a sparkplug while crusing at 80 mph halfway between DC and Milwaukee (Cleveland) on Christmas Eve. The sparkplug threads near the electrode were rounded up toward the top of the sparkplug (not what I expected) and the sparkplug ground was bent down to where it was now next to the electode. I pulled in out and ran about 25 miles on five cylinders until a repair shop fixed it the next morning. I have a three of questions: 1) In what condition was the sparkplug when it came out, 2) really how concerned do I need to be with metal shaving going into the cylinder, 3) is it possible the errant sparkplug contacted the piston before ot came out and 4) should I be looking for a new cylinder head? After the repair, my engine seemed to be running fine, but is now making "ticking" noises that sound lifter related. I love the car and would like to know if there is anything else I could/should do to help ensure it longevity. Thanks for all your help!