I heard the same urban myth years ago. I called Crane Cams to order two piece BB Mopar roller cam, stock front distributor drive welded onto a steel core, and they ask me why I wanted one, I siad for the street. The rep siad that they had a employee that had a Roadrunner with a big inch Indy motor in it that had been on the Hot Rod tour multiple yeas as well as the One Lap Around America, I assumed it was a advertisement for the company, and it had around 77,000 mile ssn the original bronze distributor drive with no porblems at that time. My 518 C.I. pump gas Duster has going on five years of street(under 2000 miles total) and strip use on its gear and still looks new The other alternative is a composite gear