[s-cars] EM stud length

[Philip Mische]

Well, thanks to long-ago busted EM stud I'm doing a little head drilling myself.  I know there's water in there somewhere and I don't want to find it with my bit.  Since my new studs aren't here yet I don't have one to measure to ensure I've got the hole deep enough.  Anyone know how long the in-the-head portion of the stud is, or depth of the tapped hole, or both?

TIA,
Phil