31" X 19" Gm Single Pass Radiatortop Left Inlet / Bottom Right Outletaluminum Radiators Features: Two-Row 1" Core. 1-1/2" Top Radiator Inlet, 1-3/4" Bottom Radiator Outlet. Exclusive Crossflow Tube Design Dramatically Increases Cooling. Reinforced Die-Stamped Tanks For Added Rigidity. Machined-Billet Filler Neck For Better Pressure Control. Brazed Core For Extra Durability. Tig-Welded Tanks. 100% Virgin Alum-No Recycled Material. Chevy / Gm-Style Rads Are A Top Left (Driver) &Amp; Bottom Right (Passenger) Configuration, &Amp; Ford / Chrysler-Style Rads Are A Top Right (Passenger) &Amp; Bottom Left (Driver) Configuration.