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What is the firing order on a 1991 F-250 with 5.8 liter engine?

The firing order for a 1991 Ford F-250 with a 5.8 liter engine (351 Windsor) is:

1-5-4-2-6-3-7-8

This means that cylinder #1 fires first, then #5, then #4, and so on.

Important Note: This is the standard firing order for most 351 Windsor engines, but it's always a good idea to double-check your specific engine by looking at the sticker under the hood or consulting your owner's manual.