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if you buy them as singles the piston weights will be all over the place ( as much as 20 grams ) and the size ( overall outside diameter ) will also be different ( sets are checked so when the time comes to box up they are somewhat close to one another ) sometimes --- > the machining is done easier if they are close if they are all over the place in size you wont end up with a good motor seal, even if you get file fit rings and try and fit each to the exact cylinder, its going in, the machinist has to be able to fit each piston to each cylinder bore < only race shops < WELL SOME - do it that way --
most pistons are out sourced to china and are real junk today if you buy good stuff you have a better chance of getting good stuff -- just my take -- jz
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