Originally Posted by
Giovanni89
I suspect it runs best at 5 degrees because the vacuum is over advancing it. The arm on the one that did not work was stamped 11.5 I measured the travel at 5mm, so i'm not sure what the 11.5 means. Maybe corresponds to a vacuum level to make it actuate? I may pull my distributor tomorrow to replace the distributor drive gear on the cam. I have been meaning to put it in for a little while now. If I do I'll pop off the vacuum unit and see what the numbers are that are stamped on the one that works well.
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