Tom forgot to check the engine to make sure everything was setup and connected or in his case disconnected and there were no tools still there.
Tom left a wrench on the crank that he used to turn the engine over by hand and when he cranked the engine it spun over and jammed on the crossmember...which in turned basically siezed the engine and bent a bunch more pushrods and valves and fun stuff.
Thats also why his car missed Austin that year.....and I belive the beginning of the fiasco was why we have pictures of Gary Morris towing Tom to the car show in Tulsa where Tom's non running car still won the car show
Matt