Following the example of the American automotive industry, in the late 1950s the tractor industry made frequent appearance updates, even though there wasn’t much new to offer technically. In the 1956 model lineup, white was added for the first time to IH’s color scheme. The engines again gained a few more horsepower — and a few models also had increased displacement. The 350 models were now also available with a Continental diesel engine. Thus, the models 350–650 were now available with gasoline, petrol, diesel, and propane engines. An unusual new feature was a hydraulic lift height indicator on the dashboard. As an option, a power-adjustable rear wheel spacing, modeled after Allis-Chalmers, was available. In 1957, a new intermediate model, the International 330, was introduced; it was basically a 350 equipped with a smaller engine. It was not available in the row-crop version.

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