Quote:
Originally Posted by rotorwrench
QC could just be "Quality Control". There are many stamps on these engines that may have a meaning but that meaning has been lost to us. Inspector stamps were common on US manufactured engines but a lot of them just have a date code that can be interpreted. The rest are likely inspector stamps at different job finishing locations in the plant.
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I wondered if the last two digits (49) might be the casting date of the block?