I have been told numerous times by multiple engine builders/shops that they can pick up 3-500 RPM simply by stabbing Ti valves in an engine. All of them advised me to run Ti intakes and exhaust valves if possible on my new engine. I was also told to keep the spring pressure under 950 over the nose with the stock cam core. My new cam is about .800 net lift and I will spring it with a 1.520 OD double that is about 350/950 and go from there. Following along with the advice I was given above we are trying to avoid a giant 1.625+ spring with valvetrain weight savings in mind.

Shiloh would be a good guy to talk to about this.