On Mon, 1 Sep 2014 12:46:49 -0600, "L Fisk" wrote:

Need to weld a broken starter mount tab (outside hole)
on a SBC block. Hole is way beyond using a thread insert
Fairly experienced at arc welding cast with nickel rod
but also have a mig welder.
Some folks have suggested using stainless mig wire
instead of nickel arc rod.
If I just weld the hole shut the new threads will cut away most of the weld.
Should I just vee it out completely to the outside and build up with beads?

I might comment that I once welded a cast iron cylinder head using TIG
and probably 308 rods and the weld was hard enough to take the end off
a HS end mill. If you will need to machine the repair it might be
something to think about.
--
Cheers,

John B.