CSRG vintage racing brings classic machinery to Thunderhill's 2.2-mile course in Northern California. If you've got a pre-1980 race car or just want to watch real drivers push legitimate vintage iron, this is the real deal. Thunderhill's challenging layout separates the committed from the casual. Full details & registration: https://www.motorsportreg.com/events/rolling-thunder-2026-thunderhill-raceway-park-csrg-030691