It was a scary event at 126mph but it happened and it shut down the track for 15 min. I would suggest looking at steel plugs if you are going to race. I know they are prone to rust but that is really not a concern in a car that that is regularly serviced. They are stronger and fit tighter when compared to the brass. I am also going to pin the plugs so this will not bite me in the future.
Jeff
Jeff