mm: The 6.9 is or was an IH engine. I don't think it was ever used as a factory installation on any farm tractor. The 6.9 had much the same outside physical appearence as the larger 550 cu in and the 800 cu in. Then one has the 7.3, got to be close to same cu in as the 550. Those engines were all cast along same exterior design lines.
The 800 cu in was used in the 300 hp articulated 4568 and 500 was used in the 1468. As I recall it wasn't rated any higher than the 1466 with inline 436, 6 cylinder. I wouldn't look very hard for one, V8 diesels, any brand have never been a roaring success, especially in tractors. They don't have as much torque as inline 6s.
I saw this myself in 1976, went to a demonstration, and one of the tractors I drove was a 1468. I came home thinking my one year old 1066, was quite a decent tractor.
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