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There are several options, including the 1250 kits already mentioned, which several members have installed. There are also a couple of excellent threads detailing what is involved. Other brands offer kits, including S&S. There is also an SE kit, which comes with high CR pistons, cams and tuner in one box, which looks good value IMHO. Stock 883 heads seem to flow very well as stock and can give great improvements in performance without any porting.
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