Those are poor performers at best. They restrict flow a lot, and don't offer as much water/tube/fin surface contact. They are designed for cooling the liquid as much as possible, rather than removing as much heat from the loop as possible. (A heater core will take a fair amount of heat from a lot of water) A radiator from a car is good too, but large, and expensive. What you are looking for is a heater core STYLE radiator, and a heater core is the best of those, due to price, size, and performance configurations.
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