1978-1988 GM G-Body Aluminum Performance Radiator. For Grand National radiator, see GMB57A. This radiator is specifically made for the 80-87 cars but will fit all G-bodies. This radiator has 1.25 inch upper hose inlet and 1.5 inch lower hose outlet. 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) 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 manual and auto trans Direct fitment for 80-87 Monte Carlo Radiator Specs Core Height 18.5 inch Core Width 26.5 inch Overall Height 18.5 inch Overall Width 31.5 inch Overall Thickness 3 inch Tubes (2) 1.25 inch Tubes Upper Hose 1.25 inch Lower Hose 1.50 inch Trans Cooler Fitting: 5/16 inch Inverted Flare