Curiousity got me earlier and had to do a quick google. I only checked one hit, but looks like Gene has the best answer and Vet the closest:
What I read was that they were block bore from the factory with a drysleeve as the part of the overhaul (after boring to accept it).
That came from SoundGuy's reply on another site, I've seen his posts before and seems quite knowledgable - from the forum menu page I'm pretty sure frequents the Ford forums here.
So [and this info being true] if the owner knows it has sleeves, it's been bored before and ready to accept new (I'd assume quite thin; and would think much care with the welding technique if that is used instead of pealing them). But Gene is probably right; see what the Ford guys say!
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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