Not Ranked
If I remember correctly the firing order of the 351W was set differently than the other members of that engine family (260,289,302, and it seems there was one smaller 221?) to reduce fatigue on the crankshaft in the 351 application. The 351 firing order was standardized for both Windsor engines with the advent of the 5.0 HO. Regardless of what might be said I would imagine the bottom line of the standardization of the pattern was the bottom line, i.e. only one cam blank for both engines. Funny thing is the 5.0 has a propensity of breaking cranks and splitting the block down the middle even at stock or near stock hp levels.
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