Update: I went to my local machine shop. It looks like this hole was never tapped when the head was made. This hole is shallower than the other holes and no sign of threads. My options are remove the head and the machine shop can repair the hole. But as my guy at the shop noted , if i have to take the head off for repair, I might as well just take the passenger head off and swap them since the "rear" of the passenger head's holes are fine. My last option if i don't want to swap heads is convert to power steering.
The power steering option has the added benefit of power steering! My question is whether the power steering bracket uses this hole? I couldn't find a diagram in my AIM for power steering but a diagram in Zazarine's resto book appears to show the power steering bracket using the hole my line points to and the hole at the 10 O'clock position. Can anyone confirm that?
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