Here is how I am figuring it and I do think it is correct. std size is 4 11/16 " which is to be 4.6875 now add .045" for an oversize and get 4.7325 now that is the BORE SIZE. Now you need clearance so for an aluminum piston lets go with .010" (cast iron would go .006" )so deduct .010" from 4.7325 and I get EXACTLY what your piston measures 4.7225
So I say you have .045" oversized pistons for either a late B or 50 or even 520-530 ? depending on what they look like. If the tops look good and not corroded ? it seems strange there is not a marking on the top of them ? Maybe they are corroded or been ground on ? A 50 would usually have thinner piston rings than a B and a 520-530 IIRC have a dome shape on top.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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