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440 Source aluminum water pump and housing. Also, cast iron thermostat housing, 180* thermostat and all Fel-Pro gaskets. Purchased in 2013 and have less than 300 miles on them. This is a late production unit and has NO cooling issues. Fits 413-426-440 RB motors. Aluminum saves about 8 lbs. over a stock cast iron set-up. $85.00 plus shipping. PM me with any questions.