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Posted (edited)

Ah... the REAL education! I never figured out why they have the other notches there...

 

The other notches, not all pully's have them, are for total advance settings. eg. 10 degrees idle + 20 degrees maximum mechanical = 30 degrees total advance. When cruising inside a certain rpm range you can add 15 degrees for vac advance. Totalling 45 degrees advance.

Edited by GJM85
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