My 422 smallblock build

SSG_Karg said
Progress has been slow lately.
Got all rings gapped and installed on pistons. Top ring gap is set at .021 and second ring is at .022 in anticipation of up to a 150hp shot of the giggle gas. These numbers were supplied by Total Seal in their instructions.
Now I’m waiting on a 1/4”x6” drill bit to come from the Amazon gods. I was eyeballing the cam bearings the other day and noticed that the #4 bearing is clocked a whisker. I’ll run the bit down through the oil passage to true up the holes and de-burr accordingly.
Also, I am in search of the tool that is used for drilling a small hole in the galley tube in each lifter bore. I have heard that Chrysler sold this at one time but I’ll be damned if I can find it. If anyone knows where to get one let me know before I commence to making something. I had originally planned to run a SFT lifter but I’m beginning to lean towards a solid roller. Either way I think a small (.030”ish) hole in each lifter bore would be beneficial, especially in a street car such as this.

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The galley has a copper tube? Can't you just center punch where you want the hole, lay the bit down as close to top of the lifter bore as you can and go to town? Position or angle isn't critical, right? Just need a bit that is long enough to get the chuck out of the way. I've never seen the drilling tool but if I had to make a jig, I'd use some aluminum turned to lifter size with a top stop band. Determine how far down you want the hole to be and drill back from the side to the top so it comes out close to the opposite edge. On small holes like that, the bit will usually get a good bite and start on a steep angle with a decent centerpunch mark.