The 425ci Nailhead V8 used in Gran Sport examples featured dual four-barrel carburetors, hydraulic lifters, and a 10.25:1 compression ratio. Power is sent to the rear wheels through a three-speed Super Turbine automatic transmission and a Positraction rear axle with 3.42:1 gears.The production order lists the Gran Sport option along with factory codes and equipment.The two-spoke steering wheel frames a 140-mph speedometer, an analog clock, a fuel-level gauge, an ambient thermometer, and warning lights for oil pressure, coolant temperature, and amperage.The odometer shows 98k miles.