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So I was looking at a 650 diesel add the other day and got to thinking. The 650 was the big dog of its day for IH. It was a 4cyl. After the 60 series came online we had 6cyl engines. The 650 gas had a 5.7L 4cyl according to tractor data. That is 350 cubic inches which is a fairly large displacement 4cyl. Question: What was the largest cube gas engine that IH used in a production tractor? Just for fun, I looked up a 766 gas and an 856 gas which were both smaller in displacement and 6cyl engines. Thoughts?