I've already explained WHY that happens, and it's not the speed of the water flow, it's the pressure increase in the block due to a restriction, just because you don't understand the physics of it, doesn't make me wrong.
can't remember where I fold the "how to" list, but I did a receipe for cleaning out the water passages in a slant that was running hotter than I thought it should, used muratic acid. it worked . I have to agree with the above notion of replicaracer 43, ...... something to consider...