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Instead of machining the vortecs for more lift, you can simply install a set of ls1 (beehive) valve springs and run to something like .525 lift. The whole set is pretty expensive though( like $250 for springs, retainers, keepers etc) but when you subtract the cost of machine work(and the waiting for the machine shop to get it finished,which can be a serious annoyance if you ask me), and a new set of regular springs, keepers etc. that can handle .525 lift. It seems allthemore worth it.
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