so if I take a cam out of a magnum, send it to have it reground to like .230 @ 050 with .500 lift, I know longer can run the factory distributor gear drive?
If that cam works with the stock gear, a regrind process itself would not touch the gear. But I dunno if the there is a re-hardening process done (though I would assume so) and if that would effect the gear surfaces also.
