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RR Valley, ND; MN native | I think #3 are Model T distributor caps.
T's use 4 separate coils and the voltage on the distributor is not the high voltage for the spark plug like something more familiar has. So, caps can be metal with just a insulated bushing for those 4 studs that had wires to the coils. The spark voltage goes from the coils to the plugs instead. | |
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