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 - Roof Palomino - Tractor or Jeep? - by Steve Nelson. My father-in-law purchased this jeep-like lawn mower back in 1968. He says he paid $1600.00 for it, which was big bucks back then for a mower. My own father bought a VW bug the same year for the same price. Well it
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