I was reading on Air Flow Research's website and it say with Hyd. roller cam the valves can float at over 6000RPMs. My redline is now set at 6800RPMs. They say the springs are good to .600 of lift and my cam only has .560 lift does anyone know if this could be a big problem or it has happened in the past but probley wont happen again?

 

ha...Bring your redline down a bit, the last thing you'll want to do is float a valve, it's a big problem. Just because the springs are "good" to .600 lift that's the max you can run them, keep that in mind. You also run into the issue the optispark has trouble with really high RPM, it's just not fast enough. The issue with valve float isn't necessarily the lift, but you also have to consider how heavy the whole valve train is, that's why the LS6 got sodium-potassium filled valve stems etc. etc. to lighten up the whole valve train so they could push the RPM higher.

 

That is why you need springs matched to the cam that you are using. The springs that come installed on new heads may not be the proper ones. Too high RPMs or a tooradical cam profile,and the springs can't keep the valvetrain in contact with the cam lobes. This keeps the valve from closing (big power loss)and chews up the valve train. Makes a good single use rev limiter, LOL