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Remember that in the day....there was no EPA and no concern with isolating toxic materials like ethylene glycol. The fill cap was pressure rated to release the glycol laden steam to an overflow hose thus releasing the pressure in the cooling system. Back in the 50's and 60's it was common to see the goose necked water cans at every filling station island to replenish the water/coolant lost to these overflow episodes. These are not your modern environmental friendly engines. My overflow looks particulary fetching dressed in stainless mesh with AN fitting and exiting directly to the garage floor below the oil pan.


Tim