I believe that all of the '66-'67 442 automatics with the snorkel-type air filter assembly have a grommet on the rear side of the snorkel, which is for what is called the K19 "closed crankcase ventilation" set-up, probably the first air pollution control device that was added to cars. It was a requirement for liberal California in '66, as were the K20 AIR pumps too. There is also a late '67 chrome air cleaner that has no snorkel. The 1966-67 manual-transmission cars got the open element air cleaners.

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