Inliners International Forums General Discussion Hi Performance Cracked rocker stud boss

Went to install a head we had reworked. While putting in the first rocker stud upto TQ, the boss cracked. Studied it and the TQ wrench and saw nothing wrong. Did the second one and had same experience. Decided this head has a weaker cast iron than usual. Here is how I fixed it. Machined the boss's down .300, leaving a .825 boss. Made a press on ring from S7 tool steel. These are 1.200 in diameter. .300 tall. Heated them up and press fit them on. Also installed a timesert repair into the 2 damaged holes. Now they TQ down as needed and the collar clears the pushrods. Painful but works perfectly.