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I have a 289 in my 67 FB and recently rebuilt my heater.....I am not sure which hose hooks up to the water pump etc....top or bottom. I had this info written down but cannot locate.
Really doesn't matter other than to help purge the air. But the illustration in my FSM (section 16)shows the top H hose goes to the choke housing and water pump and the bottom H hose goes the IM port.