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What size diesel is in the 1984 f250 ford?

The 1984 Ford F-250 offered several diesel engine options:

* 6.9L IDI: This was the most common diesel engine in the 1984 F-250. IDI stands for Indirect Injection.

There wasn't a 7.3L Power Stroke available in 1984. That engine came later. So, while you might hear about 7.3Ls in general discussion of older Fords, it wasn't an option in '84.