This OC-4 is unfortunately not at home yet.  I bought it from a local up here that became a snowbird this year.  Mother nature threw enough bad weather at us that we could not get it before he headed south.  I hope to pick it up in April when he returns.  I am just trying to gather as much information as I can in the mean time.

     It does have the replaceable sleeves in it.  I am in E-mail contact with the seller,  and he thinks it is s 1958 but is not totally sure.   It has snow pads on it with newer looking undercarriage.  He says it also has a reverser.  The reverser housing is cracked from what looks like water freezing in it.

     That's all I have on it for now.  Are there any good sources for engine kits and gaskets?

         Chris