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The vacuum advance is adjusted where you connect your vacuum hose, insert the allen wrench in the vacuum advance hose nipple and if memory serves me correctly turning the allen wrench clockwise increases the amount of advance and rotating it clockwise decreases the advance. To adjust the best it requires the use of a distributor machine but can be done also with a good timing light that shows amount of advance as motor runs through the RPM's
GMCPaul
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