1977-1987 Chevy/GMC Truck Aluminum Performance Radiator. This is the radiator that is 21 Inch high overall. See GMT556A for the 19 Inch high version. These COLD-CASE radiators are Tig welded 100 percent aluminum and absolutely beautiful. Don't buy a 3 or 4 row aluminum radiator! It doesn't cool as good as these oversize 2 row models. These radiators are original appearing and have the correct stamping. Once painted, you'd be hard pressed to find a difference over an original versus a COLD-CASE. 100 percent TIG welded All Aluminum 2 Rows of 1.25 Inch tubes Polished OE style tanks 16 fins per inch Corrugated fins that give more surface area and more thermal transfer Pressure tested For automatic trans Direct fitment for 77-87 GM Truck Radiator Specs Core Height 18.8 Inch Core Width 28.35 Inch Overall Height 21 Inch Overall Width 34.33 Inch Overall Thickness 3 Inch Tubes (2) 1.25 Inch Tubes Upper Hose 1.50 Inch Lower Hose 1.75 Inch