We carry a complete line of radiators for most size engines. For heavy duty applications we offer both 3 and 4 core radiators. All radiators are us made and come with a one year warranty against defects in workmanship. Four core radiator is not available. Use part #ra#103cb for high efficiency 3 core radiator. Regular 3 row has 9/16 on center tube spacing, offset fill tank std cooling 3 row. Can special order with high efficiency core. Core size 17-3/8 x 23-1/4 x 2. Optional dessert cooler core equal to 4 row.