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Technical Information

    A good question. The stock size should be run with all except race applications that will be kept under 6000 RPM. When you accelerate above that the fan is not going to pump any more air and the power to run it goes up to a point that the belt will slip. If allowed to slip it will turn over and other times it flies off. When this occurs it means you are beyond the RPM limit of the fan efficiency and need to use a power size pulley. They are designed to cool a high RPM engine and allow the fan to work best in the 4000 to 8000 RPM range.

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