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Gm High Energy Igniton Electronic Distributor Check Timing

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Referring to a shop manual is necessary for the initial timing specs. Check the timing with the vacuum advance disconnected and all vacuum lines connected or plugged to prevent leaks. If timing is beyond the range of the timing marks, then the distributor gear is likely at least one tooth off from its original location.
GM High Energy Ignition Electronic Distributor - Advanced HEI

 Referring to a shop manual is necessary for the initial timing specs. Check the timing with the vacuum advance disconnected and all vacuum lines connected or plugged to prevent leaks. If timing is beyond the range of the timing marks, then the distributor gear is likely at least one tooth off from its original location.  View Related Article

 

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