Rad Sprint Extruded Tube Small neck 1.5 in outlet 20 in x 22 in (4) -10 female AN port bung. Teams like Tony Stewart Racing, Steve Kinser, and Kasey Kahne Racing along with many others all depend on this radiator for quality and performance. The all-aluminum radiators are the lightest, most efficient sprint car radiators on the market. The cores are furnace brazed (no epoxy), and utilize the latest in core technology. The stock radiator features a 36mm single row core, with (4) – 10 female AN port inlets and 1-1/2 in or 1-3/4 in outlets with CNC billet radiator neck.