According to I&T, Super H (aluminum pistons) calls for 2.1 to 2.9.
Mentions "other series H-4" (which I'm going to assume is for iron pistons) at 3 to 4.
Personally I think I would stop if they were beyond 7. With fresh rings it would probably run at 10 with amazing blow-by.
The greater the clearance the greater the chance of skirt breakage so you'll have to make the call on balancing cost effectiveness, even for light duty. Mr. Aaland is right on in that the ring just can not get stabilized.
If there are machine shops in your area, you might be able to get the pistons knurled. You could then file fit each piston to its bore. It's not top tier but will work for light duty. This could be the way to go if the sleeves measure out ok.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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