AMA Superbike wasn’t the only road racing championship in America that drew big crowds. Some of the early 1990s WERA Formula USA races had substantial crowds. Here’s a photo from the Moroso F-USA round in 1991 showing home state hero Donald Jacks (leading) battling it out with Californian Chuck Graves.

Donald Jacks (leading) and Chuck Graves in a hard-fought 1991 WERA Formula USA race in front of a big crowd at Moroso Motorsports Park in West Palm Beach, Fla. (Larry Lawrence photo)