Help Finding Exhaust Valve for Newbie Engineer

[Fahlin Racing]

I believe this will help the OP out.
http://www.enginebuildermag.com/Article/1171/valve_selection_hot_valve_materials_for_hot_engines.aspx

 

[brewnog]

Since his post the OP could have gone to university, got a degree, gone back for a Masters, and worked all this out for himself.