For J. Schwiebert; Here are the Oliver numbers on 1855 block. First set is 221620, The second set is 166425A and then I believe the casting date, 9184.
 I don't think this engine has an oil cooler but can look again.
 It looks like external relief.
  Wish this thing had 4 wheel drive in it. <!-- s:( --><img src="{SMILIES_PATH}/icon_sad.gif" alt=":(" title="Sad" /><!-- s:( -->  Does say 4 wd on dash but the hole under it is empty. <!-- s:( --><img src="{SMILIES_PATH}/icon_sad.gif" alt=":(" title="Sad" /><!-- s:( -->  <!-- s:( --><img src="{SMILIES_PATH}/icon_sad.gif" alt=":(" title="Sad" /><!-- s:( --> 
 Jerry