Hello all... I'm gonna poke my nose rigth into the fun...
Although I'm new to this site, I'm not entirely new to making blocks...
My instinctive reaction to that block was.... "Hmmm wonder how that block would perform with a baseplate similar to #rotors"...
Another thing... those temps with the rad and pump you currently use, on a dual, that tells me that that little block is an overachiver, performing much better than many blocks twice it's size...
I think personaly I would however extend it to rest on the pads. Just my own paranoia thoo...
I think you will get better and more universally comparable results with the heater core and the better pump. But after reading the discussion I'm only more curious...
What results would grooves give???
I got the impression you had a dremel? that could be used to make those groves, shallow lines with the cutting wheel... A way of getting both turbulence and avoiding trapped water is to make "diamond shaped" grover ie a cross pattern but turned 45 degrees...
Anyways... I'll be back... count on that... here is a lot of fun stuff to read around here...