[Fot] Stripped Threads - RHS rear corner of block

[Don Elliott]

      A good friend here in Montreal is re-building the engine for his TR3A (used for touring) and found that the threads in the top of the block where the rear RHS head stud is supposed to secure the head has been stripped of its threads.

      He would like to know what is the best option to solving this problem. He is concerned that a heli-coil may not take the torque. Also a larger stepped stud, specially manufactured means a larger threaded hole in the block (like the heli-coil as well) and he is concerned that he may hit a water passage with both of these options.

      Any proven suggestions ?