The Spin Doctor
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This is the business end of both a small-cap and HEI-style Chevy V-8 distributor. Both distributors operate the same way, but the springs and weights are different between the two. As the distributor shaft spins, centrifugal force pulls the weights outward against the pressure of the two small springs. The combination of the mass of the weights and the spring pressure determines how quickly the curve reaches maximum advance. View Related Article
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