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the volume thing most people talk about is the coolant moves through the system too fast. it doesn't get a chance to transfer its heat to the fins before its rushed back to the engine. a double pass makes it so the fluid goes across from 1 tank to another, has to jump down the tank and go back across the lower half of the rad. this is accomplished by a plate being welded in the first tank halfway down below the inlet. you do double pass on a same side hose rad or you can do triple pass on one that is left/right hose. it let the fluid get truly cool. I have a summit rad and never ever get hot. I have never had a problem with too much rad. I have had a problem with flow.
