I took the intake and heads off this weekend to see if I could see what is locked up. It doesn't look that bad, but it will not move at all. I've filled the cylinders with Marvel Mystery oil and bumped each piston with a block of wood. Gonna let it set some more. Patience.
My father passed away last year and I inherited a 1950 F1 with a locked up flathead V8. The truck has been indoors with oil and anti-freeze for 30 years, the last time it ran was 18 years ago. I've added about $60 worth of marvel mystery oil down in the plug holes and it's been soaking for about...