Now I know my friends have already told me and I've come to the same conclusion............but I hydrolocked my car, it was tapping so we replaced the whole valve train, then we went to put the head back on and when we tried to turn the crank it was stuck, then we finally got it after some real hard pulling, and they moved frelly, the piston walls were in great shape, and as soon as the 2 and 3 piston(where the car had cut off) hit top they were stuck again, bent rods right!! fuck!! any input?