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At idle, my HEI distributor is "chattering." Seems as it may be a vacuum supply problem to the advance? Problem came along with the Thumpr cam installation. No other problems. Motor runs fine. Anyone ever experienced this? Is there a simple solution?
It started with the cam installation? Are you running a billet cam? They require a bronze dist. drive gear. Steel gear on billet cam will wear quickly, and may "chatter" as it goes away.
I have the melonized distributor gear, approved by Comp Cams for their steel cams.