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Junkyard Kustoms
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Discussion Starter · #6 ·
wow

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
 

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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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