I just used regular over the counter battery cables designed for 12 volts and my truck starts like a champ. So if you are using welding cable I would suspect poor continuity at the connection, or something, I use never seize on battery/cable connections, it works well. Even though it is possible, I highly doubt you have 2 engines in the same state of stuck. I would have done a whole lot of research into this matter before I pulled the engine. I just wish I could see how tight this engine actually is. It is very difficult to describe something like that in print though.
