I have a big block chevy that went under water in huricane ketrina,It was a complete rebuild. I have just gotten around to it now. I HAVE THE HEADS off,pan .rod,mains,caps off. It is rusty in the cylinders,and looks like silt around the pistons, Anyone know of a way of freing it up? I cannot get the crank out because the piston pins are feozen in the pistons,and wont move!