For GM Chevy 31X19 Universal Aluminum Racing Radiator Heavy Duty Extreme CoolingDescription: This double pass radiator works well for oval track racing applications where maximum efficiency is needed. The double pass design offers a 5 to 20 degree coolant temperature drop versus a standard, single pass radiator with equal core size. This double pass radiator features 100% all aluminum construction. The furnace brazed core increases durability compared to other radiators with epoxy glued or crimped gasket sealing methods. Two rows