Cooling issue

[Xack]

Originally Posted by Dwight

Lots of good responses
Over drive pulleys are not for street cars!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Dwight,
Is this comment for centrifugal pump impellers vs. scroll impellers, like Edelbrock?

Can you elaborate on this for us please. I have an Edelbrock pump (scroll impeller). I changed it on advice which stated improved temperature control. I installed a small pulley (~3:1 ratio to crank pulley) in order to get the idle RPM up to get the pump to work better at idle state. I am concerned that what I've done is up the RPM's on the pump at highway speeds to cause too much pressure on the block to possibly blow the freeze plugs!, especially if there is any restriction at the thermostat. I have placed a gutted thermostat so I do not have temperature control at all. Am I doing things here to cause more problems for myself or improving things? It sounds like to me, possibly making things worse by changing pumps, pulleys and removing thermostats.

Should I just go back to the stock, centrifugal impeller, my mildly overdriven water pump pulley and a 180 degree thermostat?

Thanks, in advance,
Xack