Nothing was beefed up. The last 6.2 made shared the same block as the 6.5, so it was considered one of the best 6.2s. Used a new one-piece rear main seal and new crankshaft. The block did not get beefed up at all. Later bigger bore 6.5s had thinner cylinder walls, not thicker.
What did happen is finally with some of the last 6.5s made, the outside main bearing bolts were made smaller. Taken down from 12 mm to 10 mm to leave more metal in the clamping area of the main cap. That was a problem area that caused many blocks to crack and crankshafts to break.
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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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