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First of all, the camshaft's job is to open and close intake and exhaust valves. It's made up of teardrop shaped lobes, and when the lobe turns away, the valve spring closes the valve. This is precisely timed, so the lobes are aligned just so. On a radical camshaft, the lobe shape is exaggerated so the valves open wider and longer, packing more air into the intake, and letting more out the exhaust. The result is more airflow through the engine, and more power.

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Q: What is a radical camshaft?
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