Drilling the brake drums

1968FormulaS340 said

Well, it takes more than drilling the drums (which I don't recommend).

You need to change the pattern of the studs. This requires a hub and/or axle change (and other assorted parts). Some people re-drill their axles (again, not something I would do, although it's probably fine).

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x2 here. Have a 71 Swinger. On the rear I installed some Moser axles with large bolt pattern. The front...new Wilwoods, so no problems. Although I did redrill my original drums, have had no issues. If you clock the drums so that the new pattern is in between the old, there is plenty of meat there. The rub is that the old drums probably are a little weak from fatigue after a lot of years. Eventually I am going to discs on the back.