Some shops and most military overhaul depots will usually leave a record of the overhaul somewhere on the engine. Usually a plate with references to the engine and a work order.
Often times after the block deck is machined the serial stampings will be slightly visible. As in this example. Sometimes by spreading a fine layer of steel filings over this number and magnetizing the block in this area will cause the filings to display the edges of the numbers. Also with a dye one can often improve the outline of these almost invisible numbers.
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