honestly i would say more people tear motors up floating valves by miss shifting not because of the springs. Normaly when you float a valve the motor want reeve past that rpm because the valve dont close. It normaly doesnt stay open far enough to hit the piston just enough to cause the motor to not reeve past a certain point. Most of the people that think they dropped a valve because of floating them either snapped the head off the valve or had another malfunction . After the fact its hard to go through motor and tell what happened first lol. I have actually had people bring me motors that wouldnt reeve past 7,000 rpms and it be because they had the valve lash set to tight and the valves were floating but it didnt hurt the motor . If your motor was reeving to 9,500 every day with no problems odds are you didnt float a valve . If you did why didnt it happen any other day ? It puts a real beating on a motor reeving to 9,500 rpms so anything could have happened but probably not floating a valve unless you miss shifted. Unless its got the shit built out of it k series is the only motor that seem to by pretty reliable at them rpms and i think thats because of the timing gears instead of timing belts (just my opinion) either way its ruff on any motor . I prefer to build a big motor turn it low rpms and drive it for three years