On another thread, I was reminded that the engine on my Z34 could be rocked forward. My question is, is the same true of the LS4? Cause if it isn't, I'm gonna have to pay someone to change my back four spark plugs.

 

You'll probably have to pay someone. That engine barely has any movement in it. It's not too terrible to reach for the back spark plugs, as they are a little higher than the 3800, but you won't get the space from just rocking the car.

 

I wouldn't pay anyone, it's really not that bad.

It will rock forward after the dog bone is disconnected. Seems stiffer to me than a 380 though. You can still ratchet strap it forward to get a bit more if needed.

Take off the coil pack bracket for more space too.