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1-3-7-2-6-5-4-8 For non-HO 5.0L (all cars other than the Mustang), firing order is 1-5-4-2-6-3-7-8. For HO 5.0L (Mustangs), firing order is 1-3-7-2-6-5-4-8.

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Q: What is the firing order for a 1986 Mercury Cougar 5.0L?
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