I remember an OVAL RACE in the late 80's or early 90's with a CLAIM / SWAP rule - the driver TQ'd and got his TQ motor claimed in round 1, put the "SWAP" motor in his car and BROKE the TQ in ROUND 2 (the guy w/ the "CLAIMED" motor went slower in round two w/ the 1st round TQ motor in HIS car)
There's SOOOO much more than just a motor being in a car. (But have to admit, the only reason I remember it was the added drama it added to the race day)