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If you're taking the head off you might as well have a machine shop do a port/polish on the intake and exhaust, it should only cost $100-200 and will make a difference. You could also have them skim a few thousandths off the head and get some 'free' hp that way, although I would just do a 904cc kit while you're in there. Might as well upgrade it while you have it apart.
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