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Re: Vacuum timing
If you connect your distributor's vacuum advance to manifold vacuum, it will advance the timing at idle and drop off after the rpm's increase. If you connect it to ported vacuum, it will not affect the timing at idle, but it will advance the timing as the rpm's increase and the vacuum increases. The vacuum advance does nothing with the weights under the rotor. The vacuum advance moves the base plate in the bottom of the distributor
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