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Discussion Starter #1 (Edited)
How much vacuum should you have at the carb to operate the advance ? I'll put a guage on it later just want to know how much.sorry the motor is a 350, bored .30 and a small cam

Thanks Tony
 

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Vacuum is dependent on your cam..


Vacuum advance works well with 20 to 12 inches HG.... below that..... you really need to rethink your timing curve and total timing
 
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