Alright, I think R&E set me up right with a short grade 8 bolt (1" long I think), a grade 8 washer (to hopefully help seal the bolt head to the header, and a nut to re-true the theads after I shorten the bolt to about 1/2". I would have preferred to stick with pipe thread, but he didn't have pipe thread plugs in an apropriately larger size in grade 8.
I have the correct size tap thanks to my coworker (and it's Craftsman so I don't have to worry if I damage it). The drill bit I have is a 1/64th of an inch too narrow, but I think that's fine.
Anyone see any issue with any of this before I go at it?
Thanks to the 3 of you that offered me taps.
