This Direct Fit radiator features two rows of 1" tubes, which doubles the cooling capacity of a factory single row. Our exclusive "press formed" end tanks are hand tig welded by expert craftsman, eliminating the factory plastic tanks. This model features a high performance 7 plate aluminum engine oil cooler for those wanting to upgrade to engine oil cooling. Oil ports are 3/4-16 SAE which are identical to the factory GM radiator. You can use the factory GM oil line assembly (quick connection fttings required) or install the #10AN fittings (included) and use SS hose assemblies.