If it's an original 312 the rear flange of the crankshaft will have a dot on itthey also used it to make 312
Apparently a very few of the 312 crankshafts don't have the dot on the rear flange but most of them do.ive had several of these engines.the 56 had the dot but not 57.you can spot them as they didnt cut out the recess where the dot goes.the only cut out is the half moon.they did have ecz caps.
The 292 & 312 blocks and crankshafts used in the '55/'57 T-birds & full-sized Fords of a given year are the same parts.Yes, people think a 312 is always a 312. I suppose it is, but the 312s were different, as highlighted above. Seems like the draft tube was different, and a water jacket drain was different too. People say 312 to me all the time, but the 312 Thunderbird Special was a different crank, and block all together, as I recall. When true car guys ask about a 312, I think they are asking about the 312 Thunderbird Special. Guess that's just me.
Sure it's very possible, why not? no argument here.im still talking about the ceck block and crank.these cranks were cast in canada and the 57 312 didnt have a dot.