Another engine ID mystery.

The 225 engine in my 84-D100 has numbers on the front of the block on the flat surface between the water pump and the deck surface. I didn't bother to clean that area good enough to get a clear read, because I don't care what it says. It is a '80's hydraulic engine, and that's all I need to know.
PS: If it is a hydraulic lifter engine it is most likely 81 or newer. Very few hydraulic engines were factory installed in the late '70's.