DO NOT PULL THE STUDS OUT unless absolutly needed. A good modern shop with BIG equipment can set them up from the crankcase end and bore them with the studs in. Pulling the studs out on a lettered series only leads to more problems as they go into the water jacket and the back of the studs get eat up and tear up the threads on the way out. I can't remember for sure if the models 50,60,70 have blind holes or ones bored into the water area ?
Now on the bore size. If you need .045" over you go 5.5" plus .045". The PISTONS are to be made to allow for any extra clearance needed. I have yet to see any that weren't. Easy enough to check beforehand.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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