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There are several kinds of pistons, basically street and racing. And among these there several types available. For street they're the 4 ring thermal strut pistons like the stock ones and hypercritic3 ring like the Egge and others. These can have tight piston to cylinder wall clearance for better oil control. For racing they're the inexpensive cast pistons or the more expensive forged pistons. These require much larger piston to cylinder wall clearance due to expansond caused by heat. However there is a very nice forged piston of material that allow them to be fit very tight, but expensive. You must check with the piston manufacture what clearance they recommend.