Hey.I have the probe low compression pistons. it had used rings on it. I asked turbo tom on which rings woulod he put on it. He told me to get the svt piston rings. They are a pretty penny for stock rings. The crank was sold to a local focaljet member. I have another built short block with the newest line of je pistons, crower i beam rods, billet main caps, clevite bearings....this is already put together. My head consist of a ford racing head with upgraded 1mm bigger valves and stronger valve springs.this head was reworked by a popular shop local to me. They have worked on high 7 sec 1/4 mile supras, big block and small block motors.etc. the head looks so damn nice. I have Mcnews turbo cams in the head also.I am thinking of selling the zx3 block...which was already honed for the probe pistons from the original owner.The brand new eagle rods and probe pistons(used) less than 4500 miles. not sure yet, but its like a feeler. how much are u thinking? this block is not asembeled