Re: press in rocker studs?
Like BillK says: Since I worked in a machine shop, I was able to grind a pilot on the 7/16X14 tap about 5/8" long that guided the tap into the hole straight. I strongly suggest that if you try threading them yourself, you buy a tap and find a local grinding shop to put a pilot on it. Just make the pilot about .374" and the threads will come out perfect. You will still need the studs that are used without the jam nuts.
For removing the studs with a nut and washers, you can use the rocker balls for spacers. If you should decide to ream the holes larger and pin the oversize studs, drill an 1/8" hole that only kisses about 1/16" of the stud, and use 1/8" roll pins. Don't drill the hole through the middle of the stud, as it only weakens the stud and the stud boss. Before you try drilling the studs, try putting a file mark in them to make sure they are soft enough to drill. I recommend that you make some form of drill fixture to get all the holes in the right place.
406 SB, Original Bill Thomas '63 Rochester FI
AFR 210, Lunati 501C2LUN, 255/263@.050", .628"
10:1, TH400, 3.31's, 4400 SS
"Life is too short to not run a solid roller cam."
"Nothing is impossible; if you don't know what you're talking about."