The King Cadillac GMC Throwback 100 was a NASCAR K&N Pro Series East race that took place at Thompson Speedway Motorsports Park in Thompson, Connecticut. The race adopted its "throwback" format in 2017. On June 4, 2019, NASCAR announced the cancellation of the 2019 event. Ricky Craven had the most triumphs of any driver, winning the event three times.