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First cousin calls me, he bought a 1974 MGB with a locked up motor. Owner drove the car for years, parked it for years, and now motor won't spin using a big breaker bar. PO had pulled the plugs and filled cylinders with Marvel Mystery Oil, and still won t budge. Cuz pulled the valve cover and nothing busted/broke. The PO said there was nothing wrong when parked so we don't think a timing chain or rod/main bearing seized . No busted block from a rod hanging out. We don't think it is a tranny or clutch lockup problem either. I have zero knowledge of this engine , whats the quickest way to determine if it's a ring or valve train lock up. thanks...