Yesterday I went to Nissan to buy the pistons for KA24E my Strocker. the guy asked me what grade. 1-2 - or 3? I know it's very important for the original engine, but is there a better grade for 3.1?
Is there a stronger one?? What is the difference between them? or is it just to match the date of different parts of the engine?sorry for the noob question but I really want to make sure to have good pistons, and yes I searched.