Re: WTB exhaust manifold or repair options
I have had a cast manifold off an olds repaired in the past. (I also have an additional cracked Ty manifold too), but the welder who did my previous work has long since retired.
What I do remember, was that the crack was ground out into a V and the manifold pre heated up very hot with Oxy acetylene and then welded with high nickel content 'rods'. I say rods, but I dont recall if it was actually Tig, or stick welded, as it was about 25 years ago, only that it was a good repair. So it can be done, if done 'properly'. As to exactly how durable it would be, I cant answer that.