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Aluminum or copper/brass, it doesn't affect the cooling ability as much as you might think, only a few percent. (Difference between a 19"x26" and a 19" x 25") The biggest problem is airflow, it doesn't matter how big your radiator is if you don't have a good fan setup. You will run cool on the highway, but get hot in traffic. A good puller fan or two and a SHROUD and you will be ahead of the game.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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