Thanks 8-ball
So I also assume that some have gotten away from the idea of not putting any resistance into the flow at the block area as well? Or not. Seems the best way to increase flow at the small area where cooling is needed, over the core, is to do something like the jets where you force water through a smaller hole to speed up flow accross the barrier? Or run a very high psi/high flow pump.
Sorry if I"m asking reahshed questions, did a search and the threads were numerous and LONG. I'm just getting into this too, like started Friday
EDIT- I did some searching on micro jet impingement, very informative. Kind of wierd to think guys at Purdue doing research on cooling micro-chips

I get why the cold water over the welded pipe works now. Less barrier due to water force from the spiggot I use. So high pressure IS the answer to cooling then. I hope this doesn't mean soemones gonna build a block and system out of a pressure washer