Quote:
Originally Posted by 2SSRS@Gen5diy
If you over rev the motor you drop valves its a known fact, that was some of the issues not all of them but most, if you plan on turning past the red line you need a good head guy to set them up no 2 ways about it.
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That's not the cause of this issue. The valvetrain simply fails and drops a valve. It actually (usually) happens during low RPM drive; the valve gets lowered, and simply stays there during low speed action.
I did own a '06 C6Z06, and drove it hard including track days until I sold it at 41K miles. I also owned a '13 Z06, and did not have any issues until I sold it (at ~ 6K miles) with most of the miles at the track. In both cases, I kept everything stock, and nothing happened. In my opinion, changing the cam or doing such other mods to LS7 is a big risk. Even GM stated they got max out of LS7. If you will need to mod the engine heavily, you might as well go with aftermarket heads (not even just modified stock heads) and lower the redline a tiny bit.
FYI, the head work was about $900, so it is not too expensive to get the heads reworked; not that I would like to do so...