[A Snake]

Mike,

Try a little reverse engineering. Take those studs without the rocker assy. and see if you can put them back in the pulled out holes. This is just to see how much thread you had holding them. If it is less than I mentioned above, that's probably what caused the problem.

I haven't looked at any of those studs, but I suspect that they are NF thread on the top and coarse (16 threads per inch) in the head. Am I right? If not, the NF is not a good choice for aluminum, even with helicoils.

Check out the amount of thread you had holding them in the head. Like I said if they are threaded shallow, they will undoubtedly pull out.

Al