Timing advance
13B street port with MSD direct fire ignition. It has Vacum advanced and if I unplug the vacum line and plug up the port when I put the timing light on it the timing continues to climb while I increase the RPMs. Is this correct or why would this happen/
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Mechanical advancers. There is a little spring inside the distributer that moves outward after a certain rpm and advances the ignition.
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At ~4000 rpm full advanced timing should be seen. This is due to the mech timing advance mechanism in the dizzy.
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Thanks for the responses! Being this having Vacum advances I didn't think it also had Mechanical advanced.
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