standard rods and C20LET pistons up to around 280 is 'safe' they will do plenty more but for how long i dont know lol my last engine was fairly standard,C20let pistons,area six valve springs and on 470cc injectors and emerald ecu it did 277bhp/295 ftlbs of torque..ive since sold that to build a higher spec one.. if you can get a 2.0 block bored cheap enough and find some good/second hand pistons(little end of rod bored too) then your laughing