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Performance Distributors locks out the vacuum advance with a plate on almost all its racing distributors because it simply isn't necessary. One option that the company does offer is a distributor with an "Instant Timing Knob."
HEI Ignition Systems - High Power HEI

 Performance Distributors locks out the vacuum advance with a plate on almost all its racing distributors because it simply isn't necessary. One option that the company does offer is a distributor with an "Instant Timing Knob."  View Related Article

 

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