I seem to recall a story I read a few years ago about a driver whose tow vehicle broke down, so he took the engine from the race car and put it into the tow vehicle, swapped it back at the track and went on to win the race!
Think it was one of the older Brazilian drivers, poss Nelson Piquet, but don't quote me on any of that. If anyone can recollect this story properly I would be interested to see it.
Max
(Just realized that thread was in the Original GT40s subforum, but I think the story I am referring to is a more local/lower category of racing).