Thought occurred to me this would be a good idea. (Can't remember if I wrote about this previously)

With any given combo of cam-lifters-springs, if you made only one change, that is,
changing out steel valves for titanium valves, your safe RPM limit would go up (safe for the valvetrain that is).

This includes hydraulic roller deals, which have definite valvespring pressure limits. So with the same valvespring
you could rev the valvetrain to a higher RPM limit with Ti valves. As a generality, this is true.

I'm interested in building a hydraulic roller engine that can reliably run at 7000 RPM with .700" valve lift.
I'm guessing you would still be limited to what, 400 lbs open spring pressure ?
Ignoring horsepower or cubic inch arguments, or cost arguments, would this valvetrain be stable ?

Now I understand that many would say to use as much valve spring pressure as you can to safeguard the valvetrain,
but my philosophy would be to use the least amount of valvespring pressure that would safely work.

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Also, is there such a thing as titanium pushrods ?