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Timing concerns with Professional Products damper

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I have the none sfi damper.  So the dampers timing marks dont indicate what number the marks actually represent. Best I can find MSA says it has marks to +20 degrees.  So that would imply the first mark would be tdc.  The distributor shaft lines up good at this mark but when I look at the piston its still coming up the bore and rotating just a scosh or scouche more for dwell i end up at the 15 degree mark.  The tang on distrubutor shaft still looks ok I think moving it a tooth would move it alot but i dont know how many teeth the thing has though.  I guess the best thing to do would be find peak intake lobe lift of the cam in relation to tdc of the piston and then remark the damper.   Thoughts?

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