I agree. My '69 was like that . I drilled them out just to service the brakes after I bought the truck. Freaked me out. I think they were done to keep some metal meat on if a drum blew-up. But if you don't shave them down close to specs that should'nt happen.
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69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint
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