Go for the P30 JDM B16 Pistons. If your using LS Rods you shouldn't have nothing to worry about. I'm not too exprienced on it, but i'm building one right now and it's going fine. you will be able to press them right onto the LS rods. My friend Also done a LS/VTEC with CTR pistons with a higher Dome height and He used a GSR head and had no problem of the piston hitting the head. It basically based on Measurements. You'll have to worry more about the Spark plug hitting. I hope i answered your question.