Cast Exhaust Manifolds (Approximately)

[Orange Crate]

Thanks but, the strength limits of brazing (especially at higher temps) is why I will stay away from that option.

[Orange Crate]

Ok, another update. I received the cast manifolds from CC and I am not impressed. These defects are in both of the manifolds I ordered and in the same place so I am guessing that the mold is the cause, maybe not? The concern is that the porosity will cause cracking during heat cycles. The pick is pointing to the deepest "pit". This area sees the highest temp and gas velocity so probably the absolute worst place for any kind of defects, pitting, porosity. I guess I could look for a foundry in the US that can cast these with better quality? This isn't high technology, casting iron is probably 1000 years old? Why can we not do this in this country anymore?