It seems that you can not run 440 water pump pulley on a 426 street hemi and not overheat at idle. The ratio will not turn the water pump pulley fast enough. Lessons learned after spending bucket loads of money on new housing ,high flow water pump, high flow thermostat, 3 row 26 radiator and the list goes on.

A big block non a/c pulley fits and works but the stock diameter of 6 13/16 is two large. Yes I am running a thin 440 style damper with all of the correct 440 (big block brackets) Does anyone sell or have a part number for a smaller diameter pulley?