Where are the ID numbers located?

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Posted by Jak on April 12, 2007 at 08:34:10 from (208.47.17.152):

351/400 engine,where are the ID casting numbers located and what are the identification numbers distinguishing the two?We removed the supposidly 400 out of the donor F150 2wd last night which won't turn all the way over,it will turn some one way and some the other way but then stops.We think that surface rust is in the cylinders.so we stopped before we tore up the rings.With this problem makes this really hard to remove all the torque converter nuts.I looked more closely at the harmonic balancers on the trucks and the 400 has what looks like external weight on it and the 351 looks to be smooth and thicker with no external weight visible.Does this sound right between the two?Thanks for the info.

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