Running white hot

What are you working on
What year
What engine
What modifications
Has it always done this
If not what changed right before this started.


If the exhost manifold was painted the white is just the paint burning off.

As for boiling at shut off, a couple issues.

1. If the rad cap is defective, or too low a pressure, the wrong type
2. If there is air in the system.
3. If the thermostat is installed backwards, bad, or stuck closed .
4. If there is incificiant air flow through the radiator
5. If the rad is clogged
6. If the water pump is defective.
7. If passages inside the block are clogged
8. A bad head gasket

The list goes on.