Ouchy!!!

Wouldnt studs help that problem?? And also I have never heard of using any shimms thicker than a few thou. It also puts extra side to side stresses on the bolts the farther away the threads are from the head. In this case it was nasty bad.

I am going to stud my rocker shafts. I have done that in the past on Higher RPM circle engines, and it has always worked fine.