I did not realize that. I am following a "How T" section on here to assemble a small block and the article pointed out a potential issue with oil pressure if left out.
See below:
Oil Galley Cup Plugs:
For this build the block that we started with had the oil galley plugs in the front of the block next to the cam already out... I have had a bad experience with my first engine that the machine shop left these out and I had to find out why my oil pressure was too low... It turned out to be these two plugs that go behind the camshaft thrust plate were left out, so I always make sure that all of my blocks have these... (I had to pull the engine and tear it down 4 times before finding the problem - so now I check for them every time...)
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