Even in modern cars, we sometimes still turn into little old ladies when driving in a torrential downpour. But in round one of the 1972 Grand Champion Series, competitors in vintage J-tin had to race through a water-drenched Fuji Speedway. At full throttle. While contending for position. With none of the ABS, ESC, AWD or the decades of tire and suspension technology that have come since. Of course, this was the historic race in which the Nissan Skyline GT-R took its monumental 50th victory. Truly epic viewing.