It is related to the larger tube size's used on the aluminum radiators which gives more surface area for heat conduction. In other words, while copper is a better conducter than aluminum, the overall efficiency of a copper/brass radiator is less than an aluminum radiator of the same general size. Aluminum radiators thus have bigger tubes, less
1. Aluminum: Chances are, your classic didn’t come from the factory with an aluminum radiator. But an aluminum radiator built specifically for your unique vehicle is always an option. Aluminum requires less physical space for your radiator to do its job and it weighs much less than its stock copper/brass counterpart. So, if space and weight I may be mistaken but, if I recall correctly, the issues with Dex-Cool weren’t limited to leaking intake gaskets. While the intake gaskets were a major issue, I seem to remember that it also caused corrosion of aluminum cooling system components including water pumps, radiators and possibly even cylinder heads. For the most part, more cores are better. For a given volume of water, more rows means more surface area; but you reach a point of diminishing return since you cool each successful row with hot air from the row in front of it. 4 is usually considered about the most you can do with copper brass and 3-4 is more typical in aluminum.
Aluminum radiators are stronger and lighter than copper radiators, they resist more damage than copper radiators, they are cheaper to produce, but copper radiators are 100% recyclable and better heat conductors, and copper radiators have the advantage of being easier to produce and maintain.
Aluminum radiators do not cool better than original types, the only thing aluminum does better is to take weight off the car. Sure they will work, and since they are new they may last longer, but there is nothing better than a recored and restored original, that is my opinion and i am sure others will disagree, but I listen to the experts like Bob at Glen-Ray Radiator who does it for a living.

Most people automatically assume that aftermarket radiators are superior or better than OEM or the more expensive units on the market. Like most things; you generally get what you pay for and higher-end radiators sport superior cooling capabilities while the lesser alternatives generally cool worse than OEM.

Benefits of Stock OEM Radiators. Stock OEM radiators, usually made from a mix of plastic and aluminum, are designed to meet your vehicle’s specific requirements. They offer reliability and compatibility, ensuring your car's cooling system operates as the manufacturer intended. These radiators are often the go-to choice for standard
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Copper or aluminum pipes full of a liquid substance that allows heat energy to transfer to heat fins and fans. The heat is then converted into vapors, which revert to a liquid after they cool. The construction and number of heat pipes determine the overall effectiveness of the radiating unit. Heat Sink Copper/Brass Radiators have been used for a long time. If you are going for a classic look, these radiators are a good choice. However, if you are going for performance, an Aluminum Radiator is what you want. Aluminum is stronger and lighter. This allows for larger tubes and less airflow restriction. Triple pass radiators, you guessed it, they flow through the radiator three times. These radiators all utilize a crossflow style radiator design. To learn more about crossflow vs downflow radiator designs visit our Toolbox article explaining their differences. Since that is covered, we can move on to the cool stuff (pun intended).
Why do aluminum radiators cool better than copper units? Copper has better thermal conductive properties than aluminum and that is why many people ask this question. The fact is, older copper radiators are made up of (4) four different materials, not just copper.
\n\n \ndo aluminum radiators cool better
The ECP radiators hold up better, but DO follow their anode directions scrupulously. You really should try to get your original radiator repaired though. The old copper radiators cool better per unit volume, just as copper conducts better per unit volume. Be this as it may, it's also more expensive, and a bit more fragile. I use a 1965 radiator
Pressure Cap Location. There is one advantage that a cross-flow radiator has over a down-flow, and that is the location of the pressure cap. All radiators use a pressure cap to prevent damage to the cooling system as the coolant heats up. With down-flow radiators, this cap has to be placed on the top tank putting it on the “high pressure
Thanks to Constant Contact for sponsoring a portion of this video. Head on over to www.constantcontact.com to learn more about what tools they offer to help The pump utilizes one-inch diameter openings and features 60 percent more flow than a factory ZL1 pump, and is compatible with the ’10 to ’14 5th-gen Camaro, and all 4th-gen F-body cars. Lingenfelter's high-capacity radiator is comprised of aluminum, and is a dual-core construction. The package is compatible with '10 to '14 Camaro SS and

Copper/brass radiators are still popular for restorations on classic vehicles and musclecars where originality is crucial and a black-painted aluminum radiator won’t do. While copper/brass radiators are heavier than aluminum, a properly-sized one will do a good job of keeping a stock or mildly-built engine cool. This Spectra Premium radiator

Unlike a regular oval shape “O” type radiator tube, CSF uses a specially engineered tube in a shape of a “B.”. These “B-tubes” are carefully formed and then brazed over the seam to seal. CSF is able to use thinner and lighter aluminum material (with better cooling efficiency) because this design is actually stronger than normal “O The cores are made up of different aluminum alloys, combining strength and heat transfer properties. Aluminum is a better conductor than brass. In other words, it is 100% aluminum conductor making its construction more efficient than comparable copper brass radiators with dissimilar metals. .