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One of our esteemed members, who is a professional engine builder, said, in an earlier thread on this topic, that it is important to burnish the cam gear on a wire wheel to take off the hard edges before installation. He said that after doing that he has built at least 35 engines with no distributor gear problems.
This subject has come up on numerous ocassions on CC. You may want to do a search and find his response, which is more definitive than mine.
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