Mishimoto MMRAD-CK-63X GM&nbsp;C/K Truck X-Line Performance Aluminum Radiator, 1963&ndash;1966, Silver Fits 1963-1966 C/K Truck Overall Size: 23 x 25.2 x 4.5 / Core Size: 17.4 x 22.8 / Rows: 3 Inlet & Outlet: 1.75 / Core Thickness: 2 / Tank Wall Thickness: 0.08 Engine Codes: 220ci, 250ci, 283ci, 292ci, 327ci, 350ci, 389ci, 421ci Mishimoto Lifetime Warranty