[Mark_C]

The engine stamps are the same on the same day. The stamps were broken down at the end of the day and then refilled with new numbers for the next days production. Granted most of the time they only changed the last digit for the day of the month, but not always. Sometimes the 1's are replaced with an I, sometimes not. As far as LA having different character heights in the VIN stamp, yes they do during certain time period, but they also have the same height and shape characters alot more frequently. It does help to know what the characteristics of the individual letters and digits are, like did Flint use 3's with a flat top, or a curved top and if they used both, when did they use each one, what days were I's inserted instead of 1's, when did they use the various shaped D's that are on DZ blocks, etc. but unless you can compare a known engine assembly stamp directly to what your looking at it is still just a guess. Might be an educated one but its still going to be a guess. Theres a lot of scumbags out there restamping blocks, and some do a pretty good job at it, while others are satisfied with a set of Harbor Freight dies.