Good catch jorb, I stuttered on the 8 when typing the Casting number above. I did correct that mistake. The block casting number is 3837004. Is it possible that the the stamped serial number is F 5 5 7, what is even close to the "7", is it possible that it could be a "Z". From what I can tell, the engine is the 6th month June, 5th day and 55 year. I need to study some more. Thanks for the note.
Al
Alan