First headgasket happened going down the track and the power to my alky went out. Second one (a year later). Had no problems at track, but it looked rich so I leaned it a little and got on it getting on the interstate, had a few backfires and my temp started going up. I now have a wideband and hopefully will get it tuned more accurately.
I put my negative cable on backwards, that's why I could figure out the short wire.