Interesting photo I have seen these engines laying around some oil fields in western Pa. years ago. I had purchased and now in the process of restoring to sell a 12 1/2 by 16" Reid that looks very much like your engine. The data I gathered years ago on this engine that it is a 95 hp at 550 rpm but this was from the modification done by the oil field owner making it a 13 1/4 x 16, he said thatthey were made to be interchangable. Just change the cylinder/water jacket and head. My lubricater is slightly different along with the air shut off system that comes directly from the "distributor" (the mechanical device that derives its power from a shaft that comes the crank), also my magneto is different. I am somewhat at a loss on how the pressure/temperature cutoff switch works if in fact that is what it is. I will try to attach photos. By the way nice flywheel paint job.Need info on a 40hp Reid Type DC compressor engine. Any help greatly appreciated.
Tom in VA