Model t engine question

I bought this weekend a motor and transmission on a half frame with front axle and belt pully on transmission. I believe was used for a saw mill or some other belt driven tool my question is when i pulled the head off number one and number two cylinder had no rod or piston, i know they did that on the air compressors but did they do that on other equipment power plants
 
Steve, even with air compressors, all 4 pistons and rods would have been in place. 2 cylinders to pump and 2 to run. Model T crank is up-down-down-up, so sounds like they were running it as a 2-cylinder engine. They may have made an intake manifold to feed just the rear port.
 
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