I have a 347 stroker motor and have recently blown it. I have it torn down pretty far and i noticed that every one of the pistons will rock back and forth in the cylinder wall. If i push on the bottom of the piston it will move every so slightly and the same will happen if i push on the top. It is like the pistons are too small for the holes. I have over a thousand miles on the setup like this with no marks on the cylinders and it ran fine. Is this normal? The cylinders have been honed out several times. Was this bad on the motor? I have since ordered .030 over pistons. Can i have a machine shop not bore it all the way out to fix my rocking piston problem or is this normal. Thanks for any advice!