Fuck thats not good mate,from what you have said it sounds like the gudgeon is screwed or one piston has lost a skirt ?I had a machine shop drop one of my pistons once (you could see where it had hit the ground) so these silly fuckers knocked it back out instead of getting me a new piston,ended up losing the skirt .Just keep your head up mate and look for someone that can get it write for you.
Dave