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Numbers found in ends are actually the Ford steel grade used...all the V8 ones I have seen are like EE-##. The EE is a grade of electric furnace Ford formula steel (the main ingresients are in the Ford Metallurgy book) and I suspect what follows may refer to the specific heat treatment used...the book gives one EE heat formula but implies there were several.
On a dropped axle, the EE is stretched into a sort of drunken sprawl...