NC hybrid setup/coolant blows heater core/how to avoid?

[Shannen Durphey]

James Ballenger wrote:
> 
> Bruce Plecan wrote:
> 
> > It reduces the amount of water bypasing the radiator, and also, helps to
> > pressurize the coolant in the head at higher rpm, reducing localized hot
> > spotting.
> 
> Ok, I just didnt know which hole you were referring to.  Would the increase in
> pressure at that point lead to a lower volume of water passed through the
> heads?  Or would that be counter-acted by the decrease in volume at the bypass?

The bypass allows coolant to return to the inlet side of the pump from
the engine block.  Reducing the diameter of the hole is akin to
plugging a leak in a pressure line.  There's more volume and pressure
available at the end of the line with the leak plugged.
Shannen