As Carl alluded too, if it's an original 1955 T-bird engine, it's not a 312.  They were 292s. To determine what it is, requires checking the end of the crankshaft flange, where a single shallow 5/16" diameter raised dot may be found. If not found, then it will require removing the oil pan. If the rod ends are marked ECZ, then it's a 312. If  marked EBU, it's a 292 or even could be a 272. Either is o.k., but don't pay a substantial  price for a non 312.. On the other hand, 312s are much more likely to have block casting cracks then the others, which may render the block as unusable.. So, proceed accordingly..     


Paul

does this engine run? I am interested
Bryan 254-722-3014 in Texas

Are you sure its a 312,but hey all y blocks are 312  lol
 Carl

I have a complete 312 with ford-o-matic and all linkages out of a '55 Tbird.  I also have the manual that was in a crate.  Located in Houston.  Make me an offer.