ever think about an open pocket design? Woth maybe a rought bottom (I think I have rea that somewhere, maybe this thread.
I would check out #rotors site. he has some great blocks like what I am talking about.
And most can be made with shop tools. and some practice.
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http://forums.procooling.com/vbb/showthread.php?s=&postid=43808#post43808
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