In general, heat transfer increases with increased fluid velocity. That's true on both sides of the heat exchanger, air and liquid in this case.That way the fluide is going through the cooler before it's dumped. Instead of dumping hot fluide to the pan. Imo it probably doesn't get cooled much as fast as it most likely moving.
Powerglides have the pressure regulator in the valve body , so converter charge starts there. There was a patent design years ago where a solenoid was incorporated on bottom of valve body that dumped converter charge at the start. I think it was called variable stall. Anyways if you wanted to or needed to make a change why not start at the source? Solenoids have to be able to withstand high temps and compatible with the fluids your using. So seals need to be high temp.Could a person bleed at the servo cover instead? Just drill and tap?
How effective was this dump valve for you? Any other sources for this valve or one like it? The link you provided does not have them in stock and the woman on the phone was not sure when they would be back. Trying to get ready for a race. ThanksSince the next question will be, "What one?" :
It has -8 inlet and outlet. I couldn't find one with -6. I use a radius fuel pump fitting with -8 radius orb, and -6 male An.