ok so this is my first time rebuilding a motor, and out of all of my blocks that i had laying around i ended up with 5 rods and 8 pistons in good shape... now out of the 5 pistons and rods, 2 of them are really loose as in takes almost no effort to move the rod, as a matter of fact if you were to leave the rod straight up and let it go it would fall to the side (when u move the rod back and forth while holding the piston steady). while on the other 3 they're kind of stiff, like if i were to have to move the rod i would have to hold the piston steady and then move the rod back and forth. now my question is why are some stiff, and some loose? are they supposed to be stiff or loose? and what part is causing it to be stiff or loose? let me know if im not being clear enough and ill try to get a video to show u guys wat i mean