SWEET! Those are the size of pins I wanted to eventually put into my Lemon Block I made so long ago.
I watched the water flow while the air was bleeding and there is not much dead water in my block. Water swirls around the pins real nicely into the outer channel and then out the outlets. Worked just like I planned it to which was a better than I was shotting for. Future revisions will have smaller pins and they will either be round or triangle shaped and not nearly as high as I have them now, and in copper.
I like the way you made that block with the hack saw! Very nice! If you use silicone use RTV type. It's all I use right now. Works pretty good. If it is good enough for cars it is good enough for a water block IMO.
