Hello, I have a complete 400 small block chevy engine witch is on the engine stand, when I took off the heads I noticed that there is some "play" on some of the pistons once I move them side to side, People tell me its because of worn piston rings! so I have bought a set of Sealed Power pistonrings At the size of 40over ingine bore. The engine is at 40 over right now so I was thinking of "freshening up" the motor by just replacing the piston rings,rod and main bearings and honing the motor. The heads are the 882's witch will get rebuilt, The pistons look in good condition and the engine cylinder walls are good, no scratches! Am I missing something? I appreciate any advice given thank's Danny.