[David]

I couldn't find any SCC problems with this material in this application; in fact it has very good corrosion resistance compared to other fastener grade stainless steels. So it looks like this is a good material for head studs.

My only concern would be the coefficent of thermal expansion which is similar to Cr-Mo steel. Since it's much lower than aluminum, there will be a cyclic stress due to the repeated heating and cooling. Since the stress at temperature is much lower than the yield stress this shouldn't be problem either.

I couldn't find material properties for ARP or Raceware, but I'll give them a call later today if I get time.