Aluminum radiators offer less weight on the front of the car. On a small tire application, such as stock, that offers an advantage. Also, aluminum radiators cool down faster than copper core radiators. That would offer an advantage also, especially when hot lapping in later rounds. I would suggest the Yellow pages in your area for a qualified radiator repair shop. They can clean and pressure check your radiator so you can again feel safe while traveling down the dragstrip. Millions befor you have traveled safely with one of those antique radiators with no problems. Or if you are really bothered by this issue, you could build a stocker that came from the factory with an aluminum tank and plastic end tanks glued on. Then you would be in compliance with the rules that state the radiator used must be for make / model and year vehicle claimed.
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