The cylinder head contains the porting needed draw in air and discharge it out again.
In addition there may be a mounting port used to attach a governor (unloading valve) and additional ports used to circulate coolant through the compressor.
Cylinder heads come with many different porting configurations, depending on the needs of the specific application.
The crankcase houses the pistons and crankshaft that do the actual pumping.
Crankcases also come in different configurations. These depend on the mounting and drive connections needed for the specific application.
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