Broken Heat Riser Tube Repair

[blakeduren]

I have an 83 C20 Suburban 454 that had that same setup.
Good news for you is that the sensor on the engine controls whether or not that “pot” gets vacuum. If your engine is warm, that pot is not getting vac and has that exhaust valve wide open(it’s default position).
The metal vacuum tube slides into that vacuum pot. It only needs one inch of rubber vacuum hose to seal the connection. Wrap the rubber in some generic heat tape to keep it from melting if so inclined. I don’t think mine had any.
I believe this would pass visual inspection.
Let us know how it pans out!