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Recently replaced ignition parts on my 66 383HP Charger including the pictured black cap. Never seen one with a breather. Standard brand I believe. Anyone else seen these and have an explanation why it would be needed? Pertronix electric ignition if that matters.
There are other posts on this issue but this is a little different. I have a 66 383 with an older Pertronix unit installed and the car has been running well but I can tell it's been in there a long time and the Pertronix owner did not recognize the number on the unit. The cap looks well used...