Hello, I discovered some hairline cracks in my 740 turbo exhaust manifold. I was wondering what people's experience and thoughts are on repairing these or letting them go.
I could feel some blow-by. TIA

 

I don't know if these are hard to find, but if they are, it would be possible to weld these to fix them. Welding a cast part like this is no easy feat, I would leave it to an experienced welder who has done them before.

 

I'd just get a used one.