Aussie
Zoom-Zoom
Your not going to be able to take an ls head to 9k. And without really good valve springs matched to your cams reving over 10k will blow your motor.took mine to 9k. it will be fine even had a buddy of mine over rev, well two of my buddys have over reved my car to like 12k.
as long as yuo have the internals to handle it the block will be fine