it look alot bigger than a 312ci its a monster but it doesnt have ramhorn exaust... it has the usual wrap around exaust that leads from one manifold to the next and then out to the exaust
Ford's "Super Duty" name originally applied to the 401, 477 and 534 gas V8's used from the late 50's until the early 80's in heavy-duty applications. I believe they used the firing order you have listed. These engines are physically huge.
One way to ascertain the difference:
Y-blocks (such as the 312) had center valve cover bolts.
SD's had perimeter valve cover bolts.
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