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Our Summit Racing HEI advance curve kit replaces the original mechanical advance. These weights extend outward in proportion to rpm, and production V-8 HEI units have a total centrifugal advance of 20 degrees (+/- 1 degree). Summit's kit is capable of 24 degrees. Take care reinstalling the e-clips that retain them; these things tend to fly, and trust us you'll never find 'em! View Related Article
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