Yup, that'd be the case normally, but according to another poster the early B block can be bored all the way out to the late B bore of 4 11/16. If that is the case there is no reason to have to sleeve your block. Just go for the late B pistons. They are cheap and readily available. That would be 3/8 of an inch of bore over your stock 4.5 inch, which I would have to believe would take care of even the worst pitting...
According to the same post the piston pins are the same size so no rod change will be necessary, only new piston pin bushings in your rods.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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