you need a 12 nut and have to grind it down 'stud n all about .025 into the nut, as in down to where you're taken .025 off the nut.
Doesn't this lose a couple threads on your highly loaded ARP nut cap?
Is this how everybody does it? Seems to me losing threads, even 1-2, is bad and worth avoiding if possible.
Should I put a tiny relief divot into the pump housing? That could save a thread maybe.