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37G, I don't have any official specs on the 35 B as far as piston to cylinder max wear before boring but would think around .007" would be about as far I would go.. A lot depends on what you want to use the tractor for & where the wear is in the cylinders, if the piston is a decent fit with just a little extra wear right at the very top where the top ring changes direction you can live with some extra wear for light duty usage.. If you have .007"-.008" wear down the bore a ways you will have piston slap & possibly excess blow-by.. You not only have to worry about excess piston clearance but also bore taper & out-of-round.. If you have a pronounced ridge at the top you probably have a fair amount of cylinder wear at the top.. ~On your hone question?.. Most tool supply houses or better auto parts stores have decent hones for sale.. Again it depends what type of hone you need.. If just using a spring type hone for de-glazing the cylinders, those are available most anywhere.. If you need a good adjustable type hone for straightening out the cylinders that will be an expensive hone & it would probably be cheaper to have your local machine shop run them for you.. ~For size??.. A good size automotive engine ridge reamer & hone should work as those early B's only have a 4-1/4" bore.. ~You might want to pull the block out pistons & all, then once out, pull the pistons out the back of the block.. That way the ridge won't have to be removed before disassembly.. Then take the pistons & block to a trusted automotive machine shop.. They will have good quality measuring equipment & more importantly a good educated eye to evaluate the bore wear & piston clearance.. ~While you have it apart check the ring side gap in the piston as that is as or more important for compression & blow-by control as anything.. ~Another important place to check is for piston pin & piston pin bore wear [a common wear area]..... ~I really can't help you on tool prices as most of my hones, reamers & measuring tools are well 20 or more years old. [email protected]
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