high speed head stock question

Recently I found a listing for a high speed model of the sb9 head stock ,what is the real difference in this versus the regular one and is there any real advantage of having one ? I am in the process of doing a conversion rewok on my model c I have not decided as yet whether it will be a B or A model thanx smitty

hello anyone out there????

Do you have any part or model numbers?

the "alleged" high speed headstock is the one that has segmented cast iron bearings.
reportedly with proper lurication can handle a sustained 1800rpm.(never tried it- just read reports from others)
IIRC - guys that ran their SB`s at that speed reported using velocite 6 for the headstock or Mobil 5W synthetic.
just to verify- we are talking about the headstock itself and not just the headstock/countershaft pulley arrangement??

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