Quote:
Originally posted by EMC2
The split flow spiral Scythe posted would take right at 2" as shown using 1/8" channels and 30mil wall thickness between channels, a .375" center circular chamber and an outermost wall thickness of 67.5 mils 
Even if you don't split the channels in two, the concept of splitting the flow two ways is a good one. Maybe later I'll do up a drawing and show why from a thermal standpoint...
(wanders back off into the blue)
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That is what I was thinking. I only have 1.5" to work with and still be able to get a seal around it. Maybe 1.75" If I push it. a 2" peice pretty much maxes out my vise for the mill anyway, not to mention 2" wide is just right for Socket A boards as anymore and you will have to mill the bottom of the block to fit around the hump on the end of the socket.