Valves weight question Ti vs Stainless

Great info, thank you guys for this. I was very curious how much you gain with titanium, I see its A LOT!
I have titanium retainers and the weight difference is significant but I was not sure if perhaps its different type of titanium for valves in regard of heat resistance and so on.

Also the guy that sold me my heads claimed that exhaust valves were Ti, turned out they were standard Edelbrock stainless valves.