Quote:
Originally Posted by cody
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. 
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Wait.. so you're going to ram an SAE threaded bolt into an NPT hole to try and plug it? Am I reading this right, or did I get confused (entirely possible) somewhere along the way? If so, that is a Bad Idea. NPT holes need NPT plugs.
And don't worry about bolt/plug grade, this isn't a structural application and I assume very little torque will be put on the fastener, so it doesn't much matter.