Colin, The casting date will tell you the when the part was made but it can’t tell you how many times the parts have been modified in the last 50-60 years. There are no sleeves in a Cub so there is a good chance that it will need to be bored if you are going to put a set of new pistons in it.
For example, my Cub had two different sizes of pistons in it. I had it bored to a uniform size and now I have a little over 67 cubic inches instead of the original 60. The connecting rod and main bearings had to be turned too in order to get them to a uniform size/clearance.
The build date of the tractor always helps when you’re trying to restore one as close to original as possible. As far as the mechanical end of any restoration, I agree with what you alluded to in your first post; if you want to make sure you have the right size: measure, measure and then check your measurements.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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