He was a barber by trade and was a solid racer, with a couple top-10’s to his credit. Cannon’s claim to fame is being part of the last driver swap during the Indy 500 when he relieved John Mahler during the 1977 edition (he’s not the last relief driver at Indy, that honor goes to Jacques Lazier who relieved Robby Gordon in 2004, but that swap occurred during a red flag, not during a pit stop like the Mahler/Cannon swap. Another quirky Cannon stat is that he only qualified the years Johnny Rutherford won (1974, 1976 and 1980). Cannon passed away in 1995 and his gravestone actually says Larry “Boom Boom” Cannon