Off the shelf Mahle pistons have 1.5/1.5/3mm rings, no problem. Donät remeber the weight, bit they were in thh "eagle 4.5" stroker kit" for a 440. I remeper hte pistons were under 600 grams each, shich in my opinion was great for an off ahlef piston. Coated too. Personally I don't like the oil ring in the pin hole, have had problems with that once, nut that was in a street engine. Something got to the ring roove and locked the oil ring.