For Chevrolet C/K Series l6 Full Aluminum 3-Row Racing Radiator Constructed of High Quality T-6061 Aluminum Construction. High Performance JDM Spec. 3-Row Racing Design Light Weight Direct Bolt-On OEM Fitment or Replacement. Stronger & Higher Capacity for Coolant than Stock Units Highly Increase Cooling Performance Overall Size: 18.75 x 22.75 x 2.50 Inch. Core Size: 17.63 x 17.38 x 2.25 Inch Inlet/Outlet Diameter: 2.25"/ 2.25"