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It might have slightly negative aspects in the very long run, down the road, but I highly doubt that you could see any reliability problems for everyday driving. I think the one you refer to is Non Fujita's 240. He has a Tomei built SR20 in it. They do make a kit that you could buy (yes it is a bore/stroke kit) to make it a 2.1 litre engine. JUN also makes a kit that bores it out to 2.2 litres (which is the one I plan on getting). The reason why there should be no reliability problems is because you are not touching the block itself, you are just replacing all the parts (Pistons, rods, valves, springs, even the crank, and of course, more). These parts are made to withstand the added stress. I think it's worth it, you do keep the high-revving aspect, and you can get more power out of the engine.
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