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Those flaps are "heat risers" here in the US. They should be open when the engine compartment is cold and thanks to a spring on the outside of the manifold, shift to the closed position.
Frozen flaps open isn't good, because they will get your carbs toasty warm. You'd rather have them frozen shut if possible. The parts are replaceable through Rusty or the Classic center. Then there's machine time.
- Two bushings
- Thick pin
- Plate
- Two screws
- Spring
- Spring stops (1 or 2, I forget)
Basically you cut the pin out, press out the bushes, install new parts.
If you're not in snow country, just weld the holes shut and don't look back.
-CTH
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