The most important aspect regarding radiator upgrades is finding one that moves engine coolant at a higher volume or has more fins per inch of core surface. Many times this will mean a thicker core or more rows of tubes in the core, but this is not always the case. In some instances upgrade radiators are the same thickness but have wider tubes, resulting in more coolant mixture flowing through the radiator and engine. Sometimes the upgrade radiator will cool more efficiently because it has more fins per inch of core surface.
Measuring the core of your radiator is a key element in being able to insure correct fit on your first order. To measure the radiator core, you need to obtain proper measurements on the thickness of the core, the height of the core, and the length of the core. Make sure you are measuring the core only. Do not measure the tanks, mounting brackets, or any other part of the radiator or fan shroud. Only measure the honeycomb, finned part of the radiator. With other engine parts in the way, it is sometimes difficult to obtain a proper measurement. Try to be as accurate as possible with these measurements, because it may make the difference between ordering the correct or incorrect radiator.
Also, installation of an upgrade radiator is not the only step in ensuring that your engine is running at proper temperature. Upon replacing or upgrading your radiator you should also have the engine flushed, check the thermostat for proper opening and closing, conduct a visual inspection of all cooling system components including all belts and hoses, and test the engine fan for proper operation.
Good Luck
CJ