I have no experience in this area...just a thought is all.
Search Youtube for welding cast iron. I guess it's possible, but requires heating the part. Getting the proper fit to the block after the repair may be a job if the metal moves on you.
Or maybe just get some headers made up (or buy some)
: Here's a photo if any of you might have a
: spare you could part with.
: --Previous Message--
: 68 spitfire Mk3: Been so happy since
: pcv valve was sorted I knew Karma was
: out to get me... The front branch of
: the cast iron exhaust manifold cracked
: clean off. Anyone ever weld or had one
: welded? I can mig, tig or braze. How
: did you do it?