Well yes and no Brandon - if the new headset's lower stack is thicker, you can remove material equal to that difference from the lower end of the head tube, and voila, you'll have the same geometry as before.
BTW, I would recommend either a Chris King headset in this case (can be used on a really short-cut fork due to its design), or reaming a couple mm off of both the top and bottom ends of the headtube if there is enough meat there (the Record / Super Record headset will have a bit more lower and upper stack - about 2.5mm each IIRC - I haven't looked it up in Sutherland's).
Greg Parker A2 MI USA
> Well yes and no. . . . if you cut off the top it'll be alright, but you
> might want to get a taller stem to compensate. Also if you cut too much
> from the top you won't be able to fully seat the top cup, becuase it will
> be butting against the toptube. As they say, "Measure twice, cut once." DO
> NOT cut from the bottom unless you want a steeper head angle.
> enjoy,
> Brandon"monkeyman"Ives
> SB, CA