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Cooling Systems, Radiators, Fans / A/C
Engine Cooling Systems, Radiators, Fans / Shrouds, water pumps, anything cooling related. Air conditioning etc.
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Old 09-23-2017, 02:32 PM   #1
byf41
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Join Date: Sep 2016
Location: West Coast
Posts: 59
Member #42580
Default BB Water Pump Pulley Diameter

I'm gonna use 1969-1971 BB Chevelle/Camaro stock GM pulleys on my 56 with LS6 BB and long water pump . In researching the possibilities for the water pump pulley I found that GM used a 7" pulley #3932402 DU OR 6 1/8" #3995631 AO . Both are readily available but my question Is which one would cool better ? My first thought was the smaller pulley would spin faster there by moving MORE coolant and cool better . Then I thought maybe the larger pulley would turn slower which would move the coolant slower there by allowing the coolant to spend more time In the radiator and allowing It to cool down more ? I suppose either one would work ok but I would like to keep It as cool as possible If It makes any difference and I wonder what GM was up to with the 2 different diameter pulleys ? Any Input on pulley diameter/cooling would be appreciated , thanks guys .
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Old 10-03-2017, 10:23 AM   #2
gmvette
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I found that the bigger pulley on the crank and the smaller on the w/p worked best for my BBC with a big aluminum NASCAR radiator from Hendricks Motor Sports. My w/p is an aluminum short Wiend. Temp seems to set at 180/190 with no thermostat. I have two gauges and sending units one in intake other in cylinder head. Readings are consistent with my hand held temperature sensor gun.

Electric fan as a puller is set up so I can toggle switch it on and off. Off prior to warm up and on expressway. On in everything else. It is an amp sucker.

Last edited by gmvette; 10-03-2017 at 10:28 AM..
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