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The International Harvester Company (IHC) has been building its own proprietary truck engines since the introduction of their first truck in 1907. International tended to use proprietary diesel engines. In the 1970s, IHC built the DVT 573 V-8 diesel of 240 and 260 hp (179 and 194 kW) but these were not highly regarded and relatively few were sold.
Through the 1940s and 1950s, tractor horsepower had increased from around 30 horsepower (22 kW) to between 40 horsepower (30 kW) to 50 horsepower (37 kW). In 1960, John Deere introduced a general crop tractor with a six-cylinder engine. International's response was the Farmall 806 and 706.
The first 2-3 digits was the horsepower rating, and the last number was the number of cylinders, so a 1486 was rated 148 hp and had a 6 cyl. engine, while the 1468 had 146 hp and a v8 engine. In 1964, IH made its four-millionth tractor, an 806. In 1965, IH introduced its first 100 hp (75 kW) two-wheel-drive tractor, the 1206.
The tractors' final drives, which were essentially made up of unaltered Letter Series components, (the 460 carried over from the model H, the 560 did the same from the model M), failed rapidly under the stress of the more powerful 60 series tractor engines. IH's competitors took advantage of the recall, and IH lost customers in the ensuing months.
The Farmall 1468 was produced beginning in 1971. It was essentially a Farmall 1466 with an International 549-cubic-inch (9,000 cc) diesel V-8 truck engine. Compared to the 1466, it was no more powerful, but made a distinctive noise and had two prominent exhaust stacks flanking the engine housing.
Case IH history began when, in 1842, Jerome Case founded Racine Threshing Machine Works on the strength of his innovative thresher. In 1869 Case expanded into the steam engine business and, by 1886, Case was the world's largest manufacturer of steam engines.
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Case IH 7140 rotary harvester with corn header with cutaway showing rotary threshing mechanism. Case IH axial-flow combines (also known as rotary harvesters) are a type of combine harvester that has been manufactured by International Harvester, and later Case International, Case Corporation, and CNH Global, used by farmers to harvest a wide range of grains around the world.