The difference in a 2004 engine and a 2014 engine serial number is as follows.Example: 2004 engine would be something like 06435, and a 2014 engine would be stamped T0614149. The first engines were stamped 4PO4, and the 2014 engines are stamped 4PO4. GM has come full circle now on the PO4 numbers, so the first method alone is not entirely accurate. As an example, a 2013 engine would read something like this, 1013426. The date code for the engine is built into the serial number after the first two numbers. However, the most accurate way is to look at the serial number on the block, which is located on the drivers side, rear, on the extended part of the deck surface that goes over the bell housing area. If you have looked very carefully and found no numbers, chances are that your block is classified as a replacement block and has no numbers stamped on that deck. For instance a 2009 engine would say 9PO4, a 2006 engine would say 6P04, etc. These numbers are located on the Passenger side front, on a square pad on the deck surface. The first way is to look at the numbers on the front of the block. There are two ways to determine the year your 604 was manufactured.
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