Newer engines had the two shafts splined together making it much easier to replace a bad compressor. Some of the older engines had the crankshaft for the compressor that was one piece with the shaft that the accessory pulley mounted on. The compressor drive gear has timing mark on it as the marks on the accessory pulley on the front of the engine has the marks you use when setting injectors and valves. Can't talk to big Cams but the small cams all did have the air compressor "timed" to the engine but NOT so it would run right.
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