How much boost are you thinking of? If you are going beyond the range of around 7-8 lbs of boost, then I would be looking at a strengthened bottom end. And IMHO, stock type cast pistons are out of the question; you might get by with them for a very low boost use, but maybe not. I have run both forged and hypereutectics in rally 4 bangers with 14-15 lbs boost with no problems, but forged is the preferred type.
