Thanks all. One thing I should probably mention, is the need to reinstall the valve bodies (plates) in the same orientation as they were removed.
Here is one of the two valve bodies, with the reed assembly in pieces:
And here is a shot showing the compressor with both valve bodies in place, awaiting the installation of the head...note that the reed valves in both bodies are aligned in the same manner, as in the reeds are 'up' in the photo, closest to the white pvc. It is possible to install these bodies 180 degrees rotated, which would place the valves "down". I believe the compressor would still function, but the inlet/outlet ports would be reversed.
If only one valve body were rotated 180 degrees however, the compressor would effectively be working against itself, with one cylinder providing pressure while the other cylinder was trying to intake. Probably cancel each other out.
