wonder why the australians are so fond of this mod ? something about steam pockets, steam bubbles and cavitating water pumps,. so more flow works better,. they run their stuff in the desert,. and when the pump is pumping water around the block thru the heads and also thru the bypass lines, if it comes to a closed thermostat, then the water gets sent around again, till it is hot enough to open the t-stat,. the theories mentioned here seem to be based on the water heading straight back into the rad,.
australians also drill the fire deck in the spots needed to increase the flow up thru the head,.
"soak" time is not the best way to remove heat, "flow' works better,.
JMHO,

nick