To quote from the Wizard site:
"Hot coolant flowing from the engine enters one tank, then passes through the tubes in the radiator core to the other tank, which then passes the coolant back into the engine. While the coolant is in the tubes of the core, the heat from the coolant transfers to the tube wall and fins. The passage of air over the core dissipates the heat transferred to the tubes and fins and the cooled down coolant is then passed back through the engine to start the cycle over. The more tube surface area there is, the better a radiator can dissipate heat and cool. (Please read to the end.)
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So, if you have both a downflow and crossflow radiators made out of the same materials, using the same build methods and using the same core dimensions,
then they will provide the same level of cooling, regardless of their position."
Entered here in the event some folks might read the quoted post and take it for truth without further reasearch...