Hi, all, I'm in the middle of a head gasket job. The head is off, and I just finished cleaning the block surface, as well as de-carboning the tops of pistons 1 and 6. I began turning the crank clockwise and got to about a quarter of a revolution and I cannot rotate it anymore. It just won't move. I then rotated it back to TDC counter-clockwise without any problem. When I try to rotate clockwise again, it won't budge. Kinda concerned here. Am I missing something simple? Like the tranny needs to be in Neutral instead of Park? Or, something terrible like a hydro-lock?