Want to hear Curt Gowdy announcing a swimming race? Here is a video of the women's 4x100m freestyle relay from the 1976 Olympics in Montreal as the USA team took the gold medal over the favored East Germans. Gowdy called the race for ABC along with analyst Donna DeVarona. Gowdy worked for NBC at the time and was still their #1 NFL play-by-play voice, but NBC loaned Gowdy to ABC for the Montreal Olympics. Gowdy also called basketball with Bill Russell at the 1976 games.
A few items of note from the clip: When the announcers appear on the screen at the 0:53 mark wearing the famous ABC yellow blazers, their press credentials are clearly visible on camera. Around the 6:23 mark, Gowdy twice cuts off DeVarona and talks for almost 20 seconds recapping the lane assignments before allowing her to make a point. Also, multiple times Gowdy refers to the event as the "4 times 100 meters".