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Frank, I think your memory is doing great! My B sn 81291 has 4 tubes. The originals were steel, the Deere replacements are brass. When I had my head off I inspected them closely and couldn't find any problems, even looking the portion inside the water jacket. I decided to change them anyway and glad I did. When I drove them out I found the pitting was worse then I could see. The two outside tubes had holes. The outside tubes are close to the edge of the head casting and were rusted through where a chuck of casting scrap (can't think if the word) got lodge between the head and tube. I cleaned up the scrap pieces of casting and used a bushing driver to install the new ones. The tubes are tapered and the small end goes toward the block. I used permatex as Frank mentioned. Finally, I have a long punch/drift with a tapered shaft. I "seated" the tubes with a couple of blows with a hammer. This worked great to swag or expand the tube into the casting. Deere didn't produce a service manual for the "B" under SN 96,000 but I have one and it really does help. There are times when you have to use common sense because some things did change. The Deere manuals are excellent but expensive...
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