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Powdered or liquid extinguishers are a no no. Severe engine damage would result. Any inert gas introduced in volume into the intake will kill the engine.

The moral of the story is it might not be a bad idea to have a CO2 extinguisher on board and handy at all times. Air leaks or no air leaks, a quick shot of that into the intake will shut it down no matter how it is running away.

check the valve covers. When the valves loosened they actually were denting the covers. Maybe yours poked some holes in it. With that lever assembly not in all the way, it wouldn't make contact with the fuel control block and would have caused your runaway. Almost the same thing that happened...

If the fuel control linkage to the shut off valve came loose, it would do exactly what happened. How do I know? It happened to a friends deuce. I replaced the head on his truck but the little clip holding the rod to the linkage to the shut off came loose or I didn't get it on just right, and the...