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					Originally Posted by WSSix  I Sodium filled valves aren't worth the money in my opinion. Their advantages don't out weight the costs involved. 
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 Not sure I 100% agree w that. Anything that lightens up the valve train (and lives, these seem to) is a good thing. 
Your advice on the LS3 heads is sound. Scroggin Dickey sells a CNC version for not much more as well.