Yes the tractor was originaly sold with different pistons than a regular 400 tractor. The pistons gave a higher compression ratio to compensate for power loss in the thinner air. IH refered to the ones marked by a D on a 400 as 5000 ft. They were sold below and above that elevation though. Most tractors received several overhauls by now, so its hard to say what pistons and sleeves are in it now. Most 400 found now have 4.125 C281 pistons and sleeves installed. Tractor and engine you have were put togeather at the factory in December of 1954. Tractor probably has the same type rear wheels unless changed as the SM.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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