[Jamo]

Again, since it was a custom grind...it may have simply been hardened material to begin with.

I'm trying to understand what you're saying in your second statement. "Factory replacement" of what engine/car? "True" roller cams? As several of us have noted, most factory hydraulic rollers used for the past decade or so in such things as my new Vette do indeed have pressed on iron gears. The hydraulic rollers being used in the FEs generally have them as well, or are hardened steel to begin with.

In the old days...as it were...bronze gears had to be used. Maybe I don't understand what you're trying to say.