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No, that shouldnt be the case. It should provide about 12° of advance regardless of where it was set. Set it at 0° and you should get 12°BTDC with the line off. There might be a TINY noticeable factor from the mechanical advance advancing it MORE when you pull the vac line off - in other words, at 1200RPMs, you might see 13-14° as opposed to 12° - but it should always cause at least 12° of advance. If it doesnt, there is something amiss with either the retarding unit, or the top plate's movement in the distributor.
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2021 Charger Scat Pack Widebody "Sinabee"
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1972 280SE 4.5
2018 Durango R/T, 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
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