Its not that you shouldn't do it, Its just not recommended.
Honestly I don't know why. You could just go with Type-S Pistons. But if you want to truly build a bullet proof bottom end, Resleave with Darton, and get Forged Pistons and Rods.
Most poeple say that the weakes link in the H22 is the Rods. Its fine for when you build a motor, but they say you can Egg your rods if you up the Rev Limiter....
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2001 Honda Prelude(Night Hawk Black)
Mods- AEM CAI, DC Sports C/C Header, Random Technology High Flow Cat., Greddy Evo Cat.back Exhaust System, AEM Tru Power Pullies, NGK Plug Wires, Denso Iridium Plugs, APEXi VAFC, Crower Stage 2 Cams, Crower Valve Spings, Crower Tit. Retainers, Crower Cam Gears, DC Sports Short Throw Shifter, RAZO Carbon Fiber Pedals and Shift Knob, Fharworks(German Racing Springs), 17x8 BBS RC's with Avon Tires, JDM SIR Blue Valve Cover. More coming, as well as TUNING!!!!