Ok,  I brought the OC-4 home finally.  The serial number tag says OC4-3G-42.

    I am wondering what other OC tractors used the same engine?  The engine on this one is apart and a basket case.  It has been open to the weather for a long time.   It's a cute little thing,  if I can get into an engine for a reasonable amount of money I will definately get it going again.  

     Here is a link to some pictures of it

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            Chris