Hudson sort of pioneered the "upside down bathtub" aerodynamics, and Nash followed along, beginning in the late 1940's and early 1950's. Hudson also built big, tough engines with lots of torque, which made them successful on the short tracks. Having nearly 70 cubic inches more than the flathead Ford helped, too. The only things Hudson had problems with were the Olds and Cadillac OHV V8's that came out in 1949, and then only on longer tracks like Daytona. Back then, half of Daytona was run on the beach, and the other half on the paved coast highway. Drivers described that as "two drag races, and a turn around a telephone pole"! A couple of Nashville drivers who ran Olds engines on that track claimed they found a layer of sand in the oil pan after the race, and totally worn out engines from the abrasives circulating with the oil. Even with the best oil bath air cleaners available at the time, enough sand got ingested to make it past the piston rings and end up in the pan.