Zlock 744cc 87mm pistons and cylinders. They are used but not by me. I don't remember why previous own pulled them from the motor. I think one of the cylinders is not round and needs refurbed. Needs a wrist pin and ring set which can be Purchased from ZlockRacing $150 shipped Also have some JE stock bore 81mm pistons with raised dome. High Compression 13.5:1+ they are used. comes with rings, wrist pins, and clips. $100 shipped