So I built the engine and everything was rotating beautifully. I leave it for a couple days and come back to work on it. I put all the stuff on it(front timing cover and chains, oil pan rear seal flywheel and im going to put the torque converter on and it doesn't rotate I slowly tear it back down and try to rotate as I take off parts. I take it all off and now its just the crank and the pistons and con rods. I loosen the con rods and it starts to rotate again. I tighten it all down again and it rotates like it did before????? just don't know what happenened.