Yes - February 15th
Your block/head cast dates versus engine assembly date are fine IMO. Rough castings at Tonawanda that were placed in foundry inventory were subsequently shipped to the motor plant on a LIFO (last in - first out) basis. So, extended time frames between cast dates and assembly dates are not uncommon. This is particularly true when physical inventories were taken at the foundry - that's when the stock that was in inventory for a long time was turned over. I have no idea why head cast dates would "usually" pre-date block cast dates by a period of weeks.
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