ok im building my buddies ls..we have gsr rods and pistons..ive heard of it done before but i think something might be wrong..i put the pistons in today and when i tightened the rod caps down..they have room that they can slide back n forth on the crank..i cant remeber it doing that on any of my other motors ive built..and also i can turn them a lil bit..like looking at it from the bottom i can turn the rod right and left a lil on the crank..is this normal or is something not fitting right? any help would be nice..thanks tr