The teams embark on a ten-hour build of two completely different vehicles. One team builds a hot rod with a big, heavy engine and the other designs a car with a light body and less powerful engine. George and Cathy get in on the shoptalk to see why the teams went the way they did and interview expert and competition judge Pat Foster, a veteran drag racer. The next day, the teams have three chances to see who can get the best possible time.