[Coloradocobra]

My brother-in-law used assembled Edelbrock heads out of the box on his SBF and he floated the valves at 5,000 rpm. Many engine builders will not buy the assembled heads because they have to throw the springs away anyway. If your cam is more radical than the matching cam that Edelbrock would sell for that application, you may indeed be floating. Get the spring recommendations from the cam grinder first but don't go overboard with too stiff springs.

Gary