One last bit of information. "8RT" is the model number for 8BA engines insttalled in trucks. "EAB" is the designation for '52-'53 passenger car engines. These are all "regular stroke" 239 ci engines. "8CM", 1CM", and "EAC" are Mercury versions of the 8BA. These all have the 4" stroke crankshaft yielding 255 ci.
Being a "Corvette Guy" myself, I will give you a bit of a warning. There are various casting codes, etc. on the 8BA engines. Except for a date stamp that may be present on the intake manifold surface, most of these have no known meaning and can't be interpreted by a "matching-numbers geek".
