Hi John,
    I sent a reply to you a few days ago....I think I did something wrong when sending it to you so you probably never received it. That's okay...it was rather longwinded and rambling anyway.
      You wrote of heating the bolts and putting beeswax on them which is something I had never heard of. I will try it. I have the next two days off so I will try to spend a little time ol the oc-3. I initially considered putting heat to the block which would expand  while the bolt receives no heat, thus would remain cooler and smaller.
   When I was young I used to watch my father put bearings on a shaft doing something similar. He would put the shaft in the deep freeze while heating the bearing in a double boiler. The difference would be just enough to make the bearing slide onto the shaft smoothly.
 I hedge a little because cast iron doesn't take uneven heating very well and I don't think I want to go thru the misery of repairs to a cracked block.
                         thanks for writing,
                           Cal