I broke the O2 sensor bung off the exhaust manifold yesterday trying to get the O2 sensor out (broke without almost any effort), and I'm trying to figure out what to do besides completely replacing the manifold. What is the stock manifold made out of? It looks like it can be welded (I see welds on the pipes...) but I'm not sure. Any idea? Is it cast iron or something else?
Thanks for the help,
1987 Fiero - 2.5L, auto tranny, stock
1970 Firebird - built 455+.030, lots 'o mods